US3350085A - Refractory lining for conical portion of a furnace and brick therefor - Google Patents

Refractory lining for conical portion of a furnace and brick therefor Download PDF

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Publication number
US3350085A
US3350085A US319252A US31925263A US3350085A US 3350085 A US3350085 A US 3350085A US 319252 A US319252 A US 319252A US 31925263 A US31925263 A US 31925263A US 3350085 A US3350085 A US 3350085A
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US
United States
Prior art keywords
brick
conical portion
lining
furnace
bricks
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US319252A
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English (en)
Inventor
Raymond E Over
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MH Detrick Co
Original Assignee
MH Detrick Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MH Detrick Co filed Critical MH Detrick Co
Priority to US319252A priority Critical patent/US3350085A/en
Priority to GB43012/64A priority patent/GB1049728A/en
Priority to DE19641433526 priority patent/DE1433526B2/de
Priority to FR992894A priority patent/FR1412781A/fr
Priority to LU47214A priority patent/LU47214A1/xx
Priority to SE12933/64A priority patent/SE316266B/xx
Priority to ES0305407A priority patent/ES305407A1/es
Priority to BE654956D priority patent/BE654956A/xx
Priority to NL6412562A priority patent/NL6412562A/xx
Priority to AT913264A priority patent/AT255310B/de
Application granted granted Critical
Publication of US3350085A publication Critical patent/US3350085A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/14—Supports for linings
    • F27D1/145—Assembling elements
    • F27D1/147—Assembling elements for bricks
    • F27D1/148—Means to suspend bricks

Definitions

  • This invention relates to a refractory lining for the conical portion of a high temperature furnace, such as a basic oxygen furnace, and to the brick used in such lining.
  • the upper portion of a basic oxygen furnace is conical in shape and open at the upper end.
  • the furnace is charged through the open end, and, after a predetermined heat period, tilted, causing the molten metal to flow out through the open end.
  • the refractory lining of the conical portion is subjected to extreme thermal an-d mechanical conditions. It therefore is important that this lining be capable of withstanding severe conditions of high temperature, thermal change and mechanical shock and abrasion.
  • One object of the invention is to provide an improved refractory lining for the conical portion of a high temperature furnace, the lining made up of superimposed annular layers or rows of refractory brick.
  • Another object is to provide a lining for the conical portion of a furnace wherein the lining is constructed with bricks of no more than four different shapes.
  • the bricks comprise two series of two bricks each, the bricks in one series having a male characteristic and the bricks in the other series having a female characteristic.
  • the two bricks in each series differ from each other in amount of taper on the edges of the top and bottom faces, referring to the installed position, whereby bricks of the two taper characteristics may be used alone and in appropriate combination to produce annular layer or rows of brick having all the diameters required by the conical portion of the furnace.
  • Another object is to provide a lining for the conical portion of a furnace wherein each component brick, apart from those at the upper and lower ends, is interlocked with at least two other component bricks.
  • This feature lends stability to the entire lining, and provides desirable intimacy between the respective bricks.
  • Another object is to provide a lining for the conical portion of a furnace made up of superimposed annular layers of refractory brick wherein the longitudinal axis of each brick is perpendicular to the plane tangent to the conical portion at the intersection of the axis with the conical portion.
  • Still another object is to provide a lining for the conical portion of a furnace wherein means are provided whereby some of the brick is anchored positively to the conical portion of the furnace both during and after installation.
  • Another object is to provide a lining for the conical portion of a furnace wherein the inner surface of the lining is substantially conical in shape, thus avoiding a corbelled inner surface.
  • the latter appears to have inferior resistance to the extreme thermal and mechanical conditions encountered in furnaces of this type.
  • Still another object is to provide a refractory brick for use in the lining of a conical portion of a furnace.
  • the brick of -the invention contemplates fourV pended claims.
  • FIG. 1 is a fragmentary longitudinal sectional View through a portion of a furnace, including the conical portion, the view showing a refractory lining embodying the invention.
  • FIG. 2 is an enlarged fragmentary sectional view on line 2 2 of FIG. l.
  • FIG. 3 in the center is an enlarged side elevational view of a brick used in the lining, the inclination of the brick corresponding to the brick inclination of FIG. l.
  • Quadral ture projections of the central brick also from part of FIG. 3, the illustrated brick being representative of one of the two brick series of the invention, namely the male series.
  • FIG. 4 in the center is an enlarged side elevational View of a brick used in the lining, the inclination of the brick corresponding to the brick inclination of FIG. 1.
  • Quadrature projections of the central brick also from part of FIG. 4, the illustrated brick being representative of the other of the two brick series of the invention, namely the female series.
  • FIG. 5 is an enlarged sectional view of an anchor means used in the invention.
  • a fragmentary part of the conical furnace portion with the refractory lining of the invention is designated 10.
  • the conical portion comprises a lower conical part 11 and an upper cap part 12, both of suitable metal.
  • the two parts have flanges 13 and 14 that cooperate to hold the two parts together.
  • Part 12 also has an inwardly extending flange 15 that defines the upper open end of the furnace.
  • FIG. 1 Other parts of the furnace illustrated in FIG. 1 include Vlower cylindrical casing 20, layers of insulation 21 and 22, insulation 23 and lower refractory lining 24 made up of horizontally disposed brick 25. These parts are not involved in the invention, as will be seen.
  • Lining 30 comprises superimposed annular rows or layers 31 of refractory brick 32.
  • each brick 32 is perpendicular to the plane tangent to conical portion 10 at the intersection point of the axis with the conical portion.
  • the inner surface of lining 30 has the same conical shape as conical portion 10. This smooth surface is an improvement over the corbelled or stepped inner surface found in many prior art linings.
  • Brick 32 used in illustrated lining 30 ⁇ fall in two series, one series having a male characteristic and the other a female characteristic.
  • each brick series includes two members, the members in each series differing slightly from each other in shape.
  • the entire lining is constructed with brick of only four different shapes.
  • the entire lining may be constructed with brick of only two different shapes.
  • the central drawing is a side elevational view of a brick designated 32AC, the brick having the shape of the brick falling in one of the two series (the AC or male series).
  • Upper face 35 of brick 32AC referring to the installed position, has alternate ribs 36 and recesses 37 which, as will be seen, interlock with the ribs and recesses of adjacent brick.
  • Lower face 4f) of brick 32AC likewise has alternate ribs 41 and recesses 42.
  • Brick 32AC has an inner face 43, referring to the installed position, that is one element of the inner surface of the lining and an outer face 44 that lies adjacent conical portion 10 of the furnace. Faces 43 and 44 are parallel to each other and perpendicular to the top and bottom faces 35 and 40.
  • Brick 32AC also has side faces 46 and 47, the two surfaces being planar, but tapering in small degree inwardly toward each other from outer face 44 and upwardly toward each other from bottom face 40.
  • top and ⁇ bottom faces 35 and 40 of brick 32AC terminate in ribs 36 and 41, thus giving this brick series the previously mentioned male characteristic.
  • outer end portions of top and bottom faces 35 and 40 terminate in recesses 37 and 42.
  • the central illustration is a side elevational view of a brick designated 32BD, this brick representing the shape of the brick falling in the other of the two series.
  • brick 32BD has an upper face 50, referring to the installed position, having alternate ribs 51 and recesses 52, and a lower face 55 having alternate ribs 56 and recesses 57.
  • Brick 32BD also has an inner face 58 and an outer face 59, the latter two faces being parallel to each other and perpendicular to the top and bottom faces 50 and 55.
  • Brick 32BD also has side faces 60 ⁇ and 61, the two surfaces being planar and tapering in small degree inwardly toward each other from outer end face 59 and upwardly toward each other from lbottom face 5S.
  • top and bottom faces 50 and S5 of brick 32BD terminate in recesses 52 and 57, thus giving this brick series the previously mentioned female charactertistic.
  • outer end portions of top and bottom faces 50 and 55 terminate in ribs 51 and 56.
  • Each annular row or layer 31 of refractory brick 32 is made up exclusively of brick of one or the other of the aforesaid two series, i.e. either the male series or the female series.
  • the annular layers of female brick alternate with annular layers of malebrick, thereby providing an interlocking relationship that gives a substantially unbroken conical shape to the inner surface of the lining.
  • the invention contemplates that some of the lining brick is anchored positively to conical portion of the furnace. Since each lining brick has interlocking relationship with at least two other bricks, and some of the bricks are fastened to the wall, it will be seen that the entire lining is attached securely to conical portion 10 and that at least some of the brick weight is carried by the conical portion.
  • vertically and circumferentially spaced means 65 serve to anchor certain of the lining brick to conical portion 10.
  • means 65 comprise short lengths of channel, 'bolted or otherwise secured to conical portion 10.
  • the channel legs 66 have outwardly extending flanges 67 that are received within recesses 52 and 57 of female brick 32BD, the flanges engaging ribs 51 and 56 to retain the bricks in place.
  • anchor channels 65 are spaced vertically so that some brick in each alternate row or layer of female brick 32BD engage a channel flange 67.
  • Male brick 32AC adjacent anchor channels 65 are reduced in length by breaking away the outer ends, and the space thereby left may be filled with castable insulating material 68.
  • the channels for each annular layer are spaced circumferentially, the circumferential spacing in FIG. 2 being the width of six brick, although this spacing may vary with the circumference of the layer.
  • each anchor channel shown in FIG. 2 is such as to engage three brick.
  • alternate groups of three brick are anchored, and intermediate groups of three brick are not anchored by a channel, but all individual brick are interlocked with adjacent brick.
  • This anchoring arrangement facilitates erection of the conical lining by eliminating the need for interior forms to hold the partially installed annular layers in place pending completion of the layer.
  • each brick is narrower in width than the bottom face at the outer end.
  • This width difference reflects the dimensional characteristics of a cone.
  • These top and bottom faces taper substantially uniformly in width toward the inner brick end, thereby giving the brick a modified pie shape.
  • the planar side faces of each brick are parallel to the adjacent side faces of laterally adjacent brick.
  • each series of brick, male and female comprises two shapes.
  • the difference in these two shapes is amount of taper.
  • Bricks 32A and 32B used in the largest diameter layers at the lower end of conical portion 10 have comparatively slight taper, while bricks 32C and 32D used at the upper end of the conical portion have a more pronounced taper.
  • the dimensions C1, C2 and C3 of brick 32C are slightly larger than the corresponding dimensions A1, A2 and A3 of brick 32A.
  • the taper in brick 32C is greater than that -in brick 32A, such increased taper being appropriate for the brick used in the smaller diameter layers.
  • the dimensions D1, D2 and D3 of brick 32D are slightly larger than the corresponding dimensions B1, B2 and B3 of brick 32B, so the brick 32D used in the smaller diameter layer has the greater taper.
  • the lower and maximum diameter layers designated A and B will consist exclusively of bricks 32A and 32B, the bricks in each series having the gentler taper.
  • the minimum diameter layers designated C and D will be made up exclusively of bricks 32C and 32D, the bricks in each series having the greater taper.
  • Each intermediate layer comprises a combination of bricks of the two tapers. In the case of a male layer, the bricks are the proper combination of bricks 32A and 32C, and in case of a female layer, the proper combination of bricks 32B and 32D. Thus, the geometric requirements of any diameter layer may be satisfied.
  • the previously mentioned modified form of lining and brick therefor contemplates only two brick shapes, the shapes, differing from each other in amount of taper, as is the case with the two brick in each of the series described above.
  • the upper face has ribs and grooves of male or female characteristic
  • the lower face has ribs and grooves of opposite characteristic.
  • the anchor channels used with such brick are provided with legs of unequal length to engage the misaligned ribs on the top and bottom surfaces of the bricks.
  • a refractory lining of uniform thickness for the conical portion of a furnace comprising:
  • each brick referring to the installed position of the brick in a conical portion of substantially vertical axis, having alternate ribs and -recesses interlocking with the ribs and recesses of adjacent bricks above and below, the side faces of each brick substantially planar;
  • top face at the outer end of each brick narrower in width than the bottom face at the outer end, the top and bottom faces tapering substantially uniformly in width toward the inner brick end, whereby the substantially planar side faces of each brick are parallel to the adjacent side faces of laterally adjacent brick;
  • top and bottom faces of some of said brick respectively tapering in Width to a greater extent than the taper of the top and bottom faces of the remaining brick, whereby brick shapes employing said two tapers may be used alone and in combination to produce annular layers of brick having all required diameters.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
US319252A 1963-10-28 1963-10-28 Refractory lining for conical portion of a furnace and brick therefor Expired - Lifetime US3350085A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US319252A US3350085A (en) 1963-10-28 1963-10-28 Refractory lining for conical portion of a furnace and brick therefor
GB43012/64A GB1049728A (en) 1963-10-28 1964-10-21 Refractory brick and furnace lining
DE19641433526 DE1433526B2 (de) 1963-10-28 1964-10-24 Feuerfester Stein fuer die Auskleidung des konischen Teils von OEfen und aus derartigen Steinen bestehendes Futter
LU47214A LU47214A1 (de) 1963-10-28 1964-10-27
FR992894A FR1412781A (fr) 1963-10-28 1964-10-27 Garniture réfractaire destinée à la partie conique d'un four, et briques destinées à la constitution de ladite garniture
SE12933/64A SE316266B (de) 1963-10-28 1964-10-27
ES0305407A ES305407A1 (es) 1963-10-28 1964-10-28 Un revestimiento para la parte conica de un horno.
BE654956D BE654956A (de) 1963-10-28 1964-10-28
NL6412562A NL6412562A (de) 1963-10-28 1964-10-28
AT913264A AT255310B (de) 1963-10-28 1964-10-28 Feuerfester Stein zur Auskleidung konischer Ofenteile und damit hergestellte Ofenfutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US319252A US3350085A (en) 1963-10-28 1963-10-28 Refractory lining for conical portion of a furnace and brick therefor

Publications (1)

Publication Number Publication Date
US3350085A true US3350085A (en) 1967-10-31

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US319252A Expired - Lifetime US3350085A (en) 1963-10-28 1963-10-28 Refractory lining for conical portion of a furnace and brick therefor

Country Status (9)

Country Link
US (1) US3350085A (de)
AT (1) AT255310B (de)
BE (1) BE654956A (de)
DE (1) DE1433526B2 (de)
ES (1) ES305407A1 (de)
GB (1) GB1049728A (de)
LU (1) LU47214A1 (de)
NL (1) NL6412562A (de)
SE (1) SE316266B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429565A (en) * 1966-12-23 1969-02-25 Harbison Walker Refractories Metallurgical degasser vessels
US3463865A (en) * 1967-01-03 1969-08-26 Edward M Sarraf Refractory block for annular linings
US3563521A (en) * 1969-02-26 1971-02-16 California Portland Cement Co Materials lifter construction and installation in kilns
US3592454A (en) * 1969-08-07 1971-07-13 California Portland Cement Co Formless installation of materials lifters and kiln lining
US4129969A (en) * 1975-06-27 1978-12-19 Jalo Haapala Structural space element
US4155703A (en) * 1976-02-25 1979-05-22 Eisenwerk-Gesellschaft Maximillianshutte mbH. Lining truncated cone walls by means of refractory bricks
US4529178A (en) * 1984-02-06 1985-07-16 M. H. Detrick Company Expansible refractory brick assembly for a furnace roof
US5316268A (en) * 1989-12-08 1994-05-31 Cra Services Limited Method for increasing the durability of refractory vessel linings
US6540510B1 (en) * 2002-03-11 2003-04-01 Weyerhaeuser Company Hemispherical dome for refractory vessel
US20040140598A1 (en) * 2002-02-07 2004-07-22 Takehiko Takahashi Lining of the cone of a converter
US20110072720A1 (en) * 2009-09-25 2011-03-31 General Electric Company Gasification cooling system having seal
US20170336146A1 (en) * 2008-01-08 2017-11-23 General Electric Company Methods and systems for controlling temperature in a vessel
CN111607675A (zh) * 2020-06-29 2020-09-01 北京瑞尔非金属材料有限公司 一种具有镶合结构的高炉炉缸陶瓷杯侧壁
US11708617B2 (en) * 2017-12-06 2023-07-25 Krosakiharima Corporation Brick lining forming method
WO2025159821A1 (en) * 2024-01-26 2025-07-31 HarbisonWalker International Holdings, Inc. Refractory layer structures and assemblies for vessels exposed to molten materials

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19726541C2 (de) * 1997-06-23 2002-11-14 Gft Ges Fuer Feuerfest Technik Verfahren zur Herstellung einer feuerfesten Auskleidung
DE19906102A1 (de) * 1999-02-13 2000-08-31 Wolfgang Moeckel Feuerfeststein

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891991A (en) * 1905-12-07 1908-06-30 Axel Hermansen Construction of regenerators.
US1224757A (en) * 1915-11-12 1917-05-01 Herman Peter Thygesen Lind Interlocking block.
US2082698A (en) * 1935-10-01 1937-06-01 Karmanocky Joseph Furnace lining
US2206205A (en) * 1939-03-13 1940-07-02 George P Selby Brick formation
US2304170A (en) * 1939-06-24 1942-12-08 Harbison Walker Refractories Furnace roof
US2319065A (en) * 1941-08-04 1943-05-11 New Jersey Interlocking Brick Furnace
US2762217A (en) * 1953-01-30 1956-09-11 Laclede Christy Company Furnace wall construction
US2854842A (en) * 1954-08-26 1958-10-07 Detrick M H Co Mounting for interlocked refractory walls
US2930601A (en) * 1956-11-06 1960-03-29 Gen Refractories Co Open-hearth furnace construction
US3088722A (en) * 1959-09-03 1963-05-07 Maerz Ofenbau Wall construction and mounting thereof for industrial furnaces
US3132447A (en) * 1961-02-20 1964-05-12 Detrick M H Co Multiple support refractory arch and wall construction
US3183625A (en) * 1961-06-23 1965-05-18 William B Jaspert Refractory furnace linings
US3274742A (en) * 1963-02-07 1966-09-27 Gen Refractories Co Refractory wall construction

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891991A (en) * 1905-12-07 1908-06-30 Axel Hermansen Construction of regenerators.
US1224757A (en) * 1915-11-12 1917-05-01 Herman Peter Thygesen Lind Interlocking block.
US2082698A (en) * 1935-10-01 1937-06-01 Karmanocky Joseph Furnace lining
US2206205A (en) * 1939-03-13 1940-07-02 George P Selby Brick formation
US2304170A (en) * 1939-06-24 1942-12-08 Harbison Walker Refractories Furnace roof
US2319065A (en) * 1941-08-04 1943-05-11 New Jersey Interlocking Brick Furnace
US2762217A (en) * 1953-01-30 1956-09-11 Laclede Christy Company Furnace wall construction
US2854842A (en) * 1954-08-26 1958-10-07 Detrick M H Co Mounting for interlocked refractory walls
US2930601A (en) * 1956-11-06 1960-03-29 Gen Refractories Co Open-hearth furnace construction
US3088722A (en) * 1959-09-03 1963-05-07 Maerz Ofenbau Wall construction and mounting thereof for industrial furnaces
US3132447A (en) * 1961-02-20 1964-05-12 Detrick M H Co Multiple support refractory arch and wall construction
US3183625A (en) * 1961-06-23 1965-05-18 William B Jaspert Refractory furnace linings
US3274742A (en) * 1963-02-07 1966-09-27 Gen Refractories Co Refractory wall construction

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429565A (en) * 1966-12-23 1969-02-25 Harbison Walker Refractories Metallurgical degasser vessels
US3463865A (en) * 1967-01-03 1969-08-26 Edward M Sarraf Refractory block for annular linings
US3563521A (en) * 1969-02-26 1971-02-16 California Portland Cement Co Materials lifter construction and installation in kilns
US3592454A (en) * 1969-08-07 1971-07-13 California Portland Cement Co Formless installation of materials lifters and kiln lining
US4129969A (en) * 1975-06-27 1978-12-19 Jalo Haapala Structural space element
US4155703A (en) * 1976-02-25 1979-05-22 Eisenwerk-Gesellschaft Maximillianshutte mbH. Lining truncated cone walls by means of refractory bricks
US4529178A (en) * 1984-02-06 1985-07-16 M. H. Detrick Company Expansible refractory brick assembly for a furnace roof
US5316268A (en) * 1989-12-08 1994-05-31 Cra Services Limited Method for increasing the durability of refractory vessel linings
US20040140598A1 (en) * 2002-02-07 2004-07-22 Takehiko Takahashi Lining of the cone of a converter
US6540510B1 (en) * 2002-03-11 2003-04-01 Weyerhaeuser Company Hemispherical dome for refractory vessel
US20170336146A1 (en) * 2008-01-08 2017-11-23 General Electric Company Methods and systems for controlling temperature in a vessel
US10619933B2 (en) * 2008-01-08 2020-04-14 Air Products And Chemicals, Inc. Methods and systems for controlling temperature in a vessel
US20110072720A1 (en) * 2009-09-25 2011-03-31 General Electric Company Gasification cooling system having seal
US8597384B2 (en) * 2009-09-25 2013-12-03 General Electric Company Gasification cooling system having seal
US11708617B2 (en) * 2017-12-06 2023-07-25 Krosakiharima Corporation Brick lining forming method
CN111607675A (zh) * 2020-06-29 2020-09-01 北京瑞尔非金属材料有限公司 一种具有镶合结构的高炉炉缸陶瓷杯侧壁
WO2025159821A1 (en) * 2024-01-26 2025-07-31 HarbisonWalker International Holdings, Inc. Refractory layer structures and assemblies for vessels exposed to molten materials

Also Published As

Publication number Publication date
DE1433526A1 (de) 1970-10-22
GB1049728A (en) 1966-11-30
AT255310B (de) 1967-06-26
SE316266B (de) 1969-10-20
BE654956A (de) 1965-02-15
NL6412562A (de) 1965-04-29
ES305407A1 (es) 1965-04-16
DE1433526B2 (de) 1970-10-22
LU47214A1 (de) 1964-12-28

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