US3283808A - Air conditioning system - Google Patents

Air conditioning system Download PDF

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Publication number
US3283808A
US3283808A US29430763A US3283808A US 3283808 A US3283808 A US 3283808A US 29430763 A US29430763 A US 29430763A US 3283808 A US3283808 A US 3283808A
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United States
Prior art keywords
air conditioning
pressure
conduit
valve
conditioning unit
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Expired - Lifetime
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English (en)
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Hochstrasser Werner
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Luwa Ltd
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Luwa Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/10—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with separate supply lines and common return line for hot and cold heat-exchange fluids i.e. so-called "3-conduit" system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/13—Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining

Definitions

  • the present invention relates to an improved air conditioning system or apparatus of the type provided with a plurality of spatially separated air conditioning units, the respective heat exchangers of which are arranged in a closed circuit with at least one central station heat exchanger through the agency of a conduit network or system for conveying a working medium, such as a heat carrier medium or fluid or a cooling medium with the aforesaid heat exchanger of each conditioning unit being connected in parallel to one another.
  • a working medium such as a heat carrier medium or fluid or a cooling medium
  • the air conditioning apparatus of the present invention can be effectively employed for heating or cooling any of the enclosures or areas to be conditioned, as the situation may require, and thus, the term air conditioning as employed herein is to be understood in its broader sense as just explained.
  • Air conditioning systems have become known to the art of the type in which-for modulation of the pressure differences appearing during operation of the installation between the inlet of the throttle valve connected in front of the heat exchanger of each air conditioning unit and the outlet of the corresponding heat exchanger, which pressure diiierences with changes of the throughflow quantity or flow rate due to displacement of the throttling valve are subjected to a variable influence-there is provided a so-called reverse return flow also designated as a Tichelmann-circuit.
  • a further important object of the present invention is to provide an improved air conditioning system for reliably furnishing heating and cooling of the enclosures or areas served thereby, allowing for generally cheaper installation of the system.
  • Still another object of the invention is to provide an improved air conditioning system which assures positive and adequate heating or cooling at all times of the areas or enclosures served thereby, employing a conduit network and system which is relatively simple and economical to install.
  • the air conditioning apparatus of the present invention generally comprises at least one central heat exchanger, an infeed conduit system and a return flow conduit system for the working fluid medium. as well as a number of heat exchangers of the spatially separated room air conditioning units, each arranged in a parallel connection between the infeed and return flow conduits, as well as throttle members arranged in front of these unit heat exchangers.
  • the invention apparatus further comprises a pump in the infeed or return flow conduits for the circulation of the working medium under pressure, and is particularly manifested by the features that each parallel connection is provided with a pressure regulator, the measurement section or unit of which, on the one hand, is operatively connected with the inlet of the associated throttle member and, on the other hand, with the outlet of the associated air conditioning unit, in order to maintain the pressure drop through such throttle member and the associated air conditioning unit constant, independent of adjustment of the throttlemember and the operating conditions of the system.
  • FIGURE 1 schematically illustrates a two-pipe duct or conduit system of an air conditioning apparatus of the present invention
  • FIGURE 2 is a vertical cross-sectional view taken through a pressure differential regulator adapted to be employed in the apparatus of FIGURE 1;
  • FIGURE 3 schematically illustrates a further embodiment of a two-pipe duct or conduit system of an air conditioning apparatus of the invention
  • FIGURE 4 is a vertical, cross-sectional view taken through a pressure differential regulator adapted to be employed in the system of FIGURE 3;
  • FIGURE 5 schematically illustrates a three-pipe" conduit system of an air conditioning apparatus of the present invention
  • FIGURE 6 schematically illustrates a further embodiment of a three-pipe conduit system
  • FIGURE 7 is a cross-sectional view of a regulating gate or slide for the conduit system depicted in FIGURE 6 and as adapted for use in the system of FIGURE 5.
  • FIGURE 1 there is depicted a conduit network with reference numeral 1 designating for instance a hot water inteed conduit or duct system connected to a central station heat exchanger 2, for example in the form of a boiler.
  • the heat exchanger 2 is supplied by a suitable circulating pump 3 arranged for instance in the return flow conduit or duct 4 in front of the aforesaid heat exchanger 2.
  • a suitable circulating pump 3 arranged for instance in the return flow conduit or duct 4 in front of the aforesaid heat exchanger 2.
  • a throttle valve 7 permitting throttling of the quantity of water or working medium flowing through the corresponding air conditioning unit 6.
  • the adjustment of the individual throttle valve 7 can thus be controlled manually or through the agency of a room thermostat, as is well known to the art.
  • a pressure regulator 8 is arranged in each parallel duct or connection 5, which in the illustrated embodiment is shown to be connected in front of its associated throttle valve 7.
  • the measuring unit or sect-ion of each such pressure regulator 8 is subjected, on the one side, to the pressure of the water at the inlet of the corresponding parallel connection 5 and, on the other side, is subjected to the pressure appearing at the outlet of the corresponding air conditioning unit 6.
  • a control line or conduit 9 is provided at each parallel connection 5, as shown, which connects the outlet of the associated air conditioning unit 6 wit-h the measuring section of the corresponding pressure regulator 8, in order to transmit the pressure appearing at the outlet of the aforesaid air conditioning unit to the measuring section of the aforesaid corresponding pressure regulator.
  • the pressure difference between the inlet of each throttle valve 7 and the outlet of the corresponding air conditioning unit 6 can be maintained constant by means of the associated pressure regulator 8 controlled in dependence of such pressure dilference.
  • FIGURE 2 there is illustrated a vertical, crosssectional view of a valve mechanism suitable as a pressure regulator 8 in any of the parallel conduits 5 of the air conditioning system shown in FIGURE 1.
  • Reference numeral 11 generally designates a housing which is closed at its upper end by means of a cover member 12. At the lower end of this housing 11 there is connected a housing portion 13.
  • a diaphragm or membrane 14 is fixedly clamped between the housing 11 and the housing portion 13 and forms part of the measuring section or unit of the pressure regulator 8.
  • An inlet connecting piece or nipple 15 opens into the housing 11, as shown, and forms a valve seat at its inner bent or flexed end 16.
  • the valve rod 18 which grips about or encircles the inlet connecting piece end 16 is riveted to a spring plate 19 bearing against the undersurface of the diaphragm 14.
  • the spring plate 19 is guided by means of its shaft or pin member 20 in the bore of an adjustment sleeve 21, said adjustment sleeve being threadably connected with an internally threaded projection piece or neck 22 of the housing portion 13.
  • the bore of the projection piece 22 is closed to the outside by means of a screw cap 23.
  • the adjustment sleeve 21 carries an abutment or support surface 24 for a pressure spring 25 acting against the spring plate 19 and having the tendency to displace such spring plate 19 upwardly, to thereby raise the valve disk 17 from the valve seat 16 through the agency of the valve rod 18.
  • the inlet connecting piece 15 is connected to the infeed side of the parallel connection 5
  • the inner compartment of the housing 11 is connected via a discharge connecting piece or nipple 27 with the inlet of the throttle valve 7.
  • the pressure prevailing in the inner compartment of the housing 11 works against one face of the diaphragm 14 and, on the other hand, the pressure prevailing in the outlet of the air conditioning unit 6 is transmitted through the associated control line 9 to the inner compartment of the housing portion 13, with this last-mentioned pressure working against that prevailing in the housing 11.
  • the pressure appearing in the housing 11 also works against the force of the spring 25, such spring force being settable or changeable by displacing the adjustment sleeve 21.
  • Both of the pressures operating against the underface of the diaphragm 14 are maintained in equilibrium with the pressure working against the upperface of such diaphragm in that, with an increase of the pressure in the inner compartment of the housing 11 the diaphragm 14 is pressed downwardly and thereby the valve disk or plate 17 is moved towards the valve seat 16 via the valve rod 18, such that the throughflow is throttled and the pressure in the inner compartment of the housing 11 again falls or drops.
  • each of the pressure regulators 8 is arranged at the inlet to the associated throttle valve 7 and the respective control lines or conduits 9 are connected with the outlet of the corresponding air conditioning unit 6.
  • pressure regulators could also be arranged at the outlet of the associated air conditioning units, whereas the control conduits in such case transmit the pressure appearing at the inlet to the throttle valve, such an arrangement being schematically depicted in FIGURE 3.
  • FIGURE 3 the elements similar to those previously described with reference to the embodiment of FIGURES 1 and 2 have here again been designated by the same reference numerals. Since in the embodiment of FIGURE 3, the pressure regulators 8 of FIGURES 1 and 2 are not placed at the inlet side of the associated throttle valves 7, but instead, pressure regulators 8' of somewhat different construction are arranged at the outlet side of the associated air conditioning unit 6, each such pressure regulator 8 must work in an opposite direction to the pressure regulator 8 depicted in FIGURE 2. In order to render such possible, the pressure regulators 8 each embody the construction depicted in FIGURE 4.
  • each such pressure regulator 8' comprises a housing formed of three housing portions 30, 31 and 32. Between the two outermost housing portions and 32 and the central portion 31 there are clamped two membranes or diaphragms 33 and 34, as shown.
  • the diaphragms 33 and 34 divide the inner compartment of the regulator housing into an inlet chamber 35, a return flow chamber 36 and a control chamber 37.
  • the control line or conduit 9 (FIGURE 3) opens into the control chamber 37 via the connecting piece or nipple 38.
  • the return chamber 36 contains an outlet feed pipe or stud 39 operably connected with the return flow conduit 4 as well as an inlet feed pipe or stud 40 which is operatively connected with the associated heat exchanger of each air conditioning unit 6.
  • a channel 41 branching-off from the inlet feed pipe 40 opens into the inlet chamber and permits exposing the diaphragm 34 to the pressure appearing at the outlet or return flow side of the associated air conditioning unit 6.
  • the inlet feed pipe leading into the interior of the return flow chamber 36 is bent at its inner end and forms a valve seat or opening 42 scalable by means of a valve disk 43 acted upon or influenced by the diaphragm 33.
  • the valve disk 43 is held by a sleeve 44 provided with diametrically opposed openings 45, its upper end communicating with a plate member 47.
  • the diaphragm 34 bears at its central region against this plate member 47, said central region being placed under load by a pressure spring 49 via a plate member 48.
  • the upper end of the pressure spring 49 rests against an adjust ment screw 50 threaded into the housing portion 32.
  • the threepipe system exhibits a conduit network comprising two infeed conduits l and 1" as well as the return flow conduit 4, with there being provided from both of the infeed con- 5" for each air conditioning unit 6.
  • a changeover or reversal throttle valve 7 is arranged in front of, that is at the inlet side of each air conditioning unit 6,. both of the inlets of said reversal throttle valve are operatively coupled via a respective pressure regulator 8 with the corresponding parallel branch conduit 5' and 5", respectively.
  • These pressure regulators 8 may advantageously be of the type described and shown with respect to the discussion of FIGURE 2.
  • Both of the infeed conduits 1 and 1" conduct in known manner working medium, such as for instance hot water and cold water, respectively, prepared in the central heat exchangers 2' and 2", respectively. Both of the heat exchangers 2 and 2 are supplied with water from the return flow conduit 4 through the agency of a common feed pump 3.
  • reversal throttle valve 7 one is concerned in principle with a three-way valve which, however, is simultaneously in a position to quantitatively control the infeed out of the connecting branch to the associated air conditioning unit 6.
  • a valve of this type is illustrated by way of example in FIGURE 7 wherein, moverover, the therein illustrated construction has still further functions, as will be apparent from the discussion to follow. It is further to be mentioned that actuation of the reversal throttle valve 7 takes place through a servomotor which, for example, is controlled by the room temperature.
  • each regulator 8' is arranged at the outlet of each air conditioning unit 6 whereby, however, care must be taken that each such regulator 8 is always subjected, via .the control line 9, with that working medium which in this period of time flows through the associated air conditioning unit.
  • the reversal throttle valve 7" shown in section in FIGURE 7 is employed, and which at the same time is also in a position to operatively couple the control line 9 with that branch conduit 1 or 1" which momentarily is coupled with the air conditioning unit 6.
  • each regulator 8' may advantageously possess the construction depicted and described with reference to FIGURE 4.
  • the throttle valve 7 comprises a housing 52 provided with inlet connections or studs 53 and 54 as well as an outlet connection or stud 55.
  • a valve slide or spool 56 which extends via a actuating rod 57 provided at its upper end piercingly through a guide and packing sleeve 58 threadably received in the housing 52, with the aforesaid actuating rod operatively connected with the servomotor 90.
  • the valve slide 56 extends through two sealing lip rings 59 and 60 advantageously arranged above and beneath the outlet stud or connection 55, as shown, to divide the interior of the housing 52 into three chambers or compartments 61, 62 and 63.
  • the valve slide 56 carries at. its central region four, lengthwise extending V-shaped slots or grooves 64 which, depending upon the position of the valve slide 56 relative to the sealing rings 59 and 60, operatively couple with a predetermined throughfiow cross-section the one or the other of the inlet chambers 61 or 63 with the outlet chamber 62.
  • the construction of the valve 7" described up to the present is sufiicient to achieve a switching and throttling of the working medium supplied to the corresponding air conditioning unit 6, and therefore fulfills the requirements of the throttle valve 7 of FIGURE 5.
  • an extension cap 65 is threadably connected to the lower end of the housing 52 containing two further sealing lip rings 66 and 67. Intermediate the two sealing rings 66 and 67 there opens a connecting channel or bore 68 which serves to communicate the control line 9 with an outlet pipe or stud 69.
  • An auxiliary slide 70 is provided at the lower end of the valve slide 56 which, in the illustrated upper terminal position of the valve slide 56, extends into the sealing ring 66 and thereby closes the chamber 63 with respect to the inner compartment 71 of the extension cap 65.
  • the auxiliary slide 70 is provided with a notch 72 at the portion of such slide 70 which connects to the valve slide 56, this notch 72 in its lower terminal position arriving in the zone of the sealing ring 66.
  • the auxiliary slide 70 is further provided with a longitudinal bore 73 which extends through a portion of the valve slide 56 and in the upper terminal position of the latter opens into the compartment or chamber 61.
  • valve slide 56 moves further downwards then, first of all, the throughpassage between the hot water inlet 53 and outlet 55 is completely closed by the sealing ring 59. A short time later the end of the slide member 70 enters the sealing ring 67, whereby also the connection between the hot water inlet 53 and the bore 69 is interrupted. With further axial movement the connection between the cold water inlet 54 and the channel or bore 68 through the sealing ring 66 is freed via .the notch 72 and, if the valve slide moves further, the sealing ring 60 via the notches 64 gradually frees the path from the chamber 63 to the chamber 62 and then to outlet 55.
  • Air conditioning system comprising at least one central heat exchanger, a conduit network including infeed and return feed conduit means and parallel branch connections therebetween for a fluid working medium, a plurality of spatially separated air conditioning units each operatively connected with one of said parallel branch connections between said infeed and return feed conduit means, throttle means communicating with each of said air conditioning units, a pump provided in said conduit network for circulating said working medium under pressure, a pressure regulator provided for each parallel branch connection, each pressure regulator including a measuring unit connected at one side with the inlet of the associated throttle means and at the other side with the outlet of the associated air conditioning unit for maintaining the pressure drop through such throttle means and its associated air conditioning unit constant independent of the setting of such throttle means and the operating conditions of the system.
  • Air conditioning system comprising at least one central heat exchanger, a conduit network including infeed and return feed conduit means and parallel branch con nections therebetween for a fluid working medium, a plurality of heat exchangers of spatially separated room air conditioning units each arranged in one of said parallel branch connections between said infeed and return feed conduits means, throttle means arranged in front of each of said heat exchangers of said room air conditioning units, a pump provided in said conduit network for circulating said working medium under pressure, a pressure regulator provided for each parallel branch connection, each pressure regulator including a measuring unit connected with the inlet side of the associated throttle means and with the outlet side of the associated room air conditioning unit for maintaining the pressure drop through such throttle means and its associated air conditioning unit constant independent of the setting of such throttle means and the operating conditions of the system.
  • each pressure regulator is arranged at said outlet side of its associated room air conditioning unit, control line means for connecting said pressure regulator to said inlet side of its associated throttle means.
  • each pressure regulator is arranged at said inlet side of its associated throttle means, control line means for connecting said outlet side of the associated room air conditioning unit of each parallel branch connection to its associated pressure regulator.
  • Air conditioning system for a heating working medium and for a cooling working medium, said conduit network including separate infeed conduit means for each heating and cooling working me dium and common return feed conduit means for both aforesaid working mediums, each of said throttle means including two inlets and being constructed to operate as a reversing mechanism, one said pressure regulator arranged at each of said inlets of said throttle means common control line means operatively connecting said measuring units of both pressure regulators to the outlet side of the associated air conditioning unit.
  • Air conditioning system for a heating working medium and for a cooling working medium, said conduit network including separate infeed conduit means for each heating and cooling working medium and common return feed conduit means for both aforesaid working mediums, each of said throttle means being provided with two inlets and being constructed to operate as a reversing mechanism, each said pressure regulator being arranged at said outlet side of its associated conditioning unit, control line means for operably connecting each said pressure regulator with a reversal valve operably coupled with the associated reversing throttle means.
  • each reversal valve forms a part of its associated reversing throttle means, each reversing throttle means including a reversal slide member, each reversal valve including an auxiliary slide operably coupled with said reversal slide member, said auxiliary slide having an outlet which depending upon the position of said reversal slide member operably communicates with one of said two inlets of said reversing throttle means.
  • Air conditioning system comprising at least one central heat exchanger, a conduit network including infeed and return feed conduit means and parallel branch connections therebetween for a fluid working medium, said infeed and return feed conduit means having an inlet side and an outlet side respectively, located at the same end of said conduit network, a plurality of spatially separated air conditioning units each operatively connected with one of said parallel branch connections between said infeed and return feed conduits means, throttle means communicating with each of said air conditioning units, a pump provided in said conduit network for circulating said working medium under pressure, a pressure regulator provided for each parallel branch connection, cache References Cited by the Examiner UNITED STATES PATENTS 4/1965 Windham 165-22 ROBERT A. OLEARY, Primary Examiner. CHARLES SUKALO, Examiner.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Multiple-Way Valves (AREA)
  • Temperature-Responsive Valves (AREA)
  • Other Air-Conditioning Systems (AREA)
US29430763 1962-07-13 1963-07-11 Air conditioning system Expired - Lifetime US3283808A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT567662A AT231661B (de) 1962-07-13 1962-07-13 Klimaanlage und Differenzdruckregler hiefür

Publications (1)

Publication Number Publication Date
US3283808A true US3283808A (en) 1966-11-08

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US29430763 Expired - Lifetime US3283808A (en) 1962-07-13 1963-07-11 Air conditioning system

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US (1) US3283808A (de)
AT (1) AT231661B (de)
CH (1) CH413288A (de)
ES (1) ES289897A1 (de)
GB (1) GB1042466A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010145040A1 (en) * 2009-06-16 2010-12-23 Dec Design Mechanical Consultants Ltd. District energy sharing system
US20140085821A1 (en) * 2012-09-25 2014-03-27 Liquidcool Solutions, Inc. Method and apparatus to manage coolant pressure and flow for an array of liquid submerged electronic devices

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48100747A (de) * 1972-04-01 1973-12-19
FI98856C (fi) * 1994-01-24 1997-08-25 Abb Installaatiot Oy Termisen energian jakelujärjestelmä
FI98857C (fi) * 1994-01-24 1997-08-25 Abb Installaatiot Oy Menetelmä ja järjestelmä lämmitys- ja/tai jäähdytystehon siirtämiseksi

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176759A (en) * 1960-06-03 1965-04-06 Elwood A Windham Air conditioning systems

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176759A (en) * 1960-06-03 1965-04-06 Elwood A Windham Air conditioning systems

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010145040A1 (en) * 2009-06-16 2010-12-23 Dec Design Mechanical Consultants Ltd. District energy sharing system
CN102460024A (zh) * 2009-06-16 2012-05-16 Dec设计机械顾问有限公司 区域能量共享系统
CN102460024B (zh) * 2009-06-16 2014-12-10 Dec设计机械顾问有限公司 区域能量共享系统
EA022321B1 (ru) * 2009-06-16 2015-12-30 Дек Дизайн Микэникл Кэнсалтентс Лтд. Система энергоснабжения
US20140085821A1 (en) * 2012-09-25 2014-03-27 Liquidcool Solutions, Inc. Method and apparatus to manage coolant pressure and flow for an array of liquid submerged electronic devices
US9451726B2 (en) * 2012-09-25 2016-09-20 Liquidcool Solutions, Inc. Method and apparatus to manage coolant pressure and flow for an array of liquid submerged electronic devices
US9918408B2 (en) 2012-09-25 2018-03-13 Liquidcool Solutions, Inc. Method and apparatus to manage coolant pressure and flow for an array of liquid submerged electronic devices

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Publication number Publication date
CH413288A (de) 1966-05-15
ES289897A1 (es) 1964-01-01
GB1042466A (en) 1966-09-14
AT231661B (de) 1964-02-10

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