US3729883A - Demountable partition assemblies and the studs therefor - Google Patents
Demountable partition assemblies and the studs therefor Download PDFInfo
- Publication number
- US3729883A US3729883A US00136106A US3729883DA US3729883A US 3729883 A US3729883 A US 3729883A US 00136106 A US00136106 A US 00136106A US 3729883D A US3729883D A US 3729883DA US 3729883 A US3729883 A US 3729883A
- Authority
- US
- United States
- Prior art keywords
- members
- studs
- stud
- partition
- interengaging
- 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
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/74—Removable non-load-bearing partitions; Partitions with a free upper edge
- E04B2/7407—Removable non-load-bearing partitions; Partitions with a free upper edge assembled using frames with infill panels or coverings only; made-up of panels and a support structure incorporating posts
- E04B2/7453—Removable non-load-bearing partitions; Partitions with a free upper edge assembled using frames with infill panels or coverings only; made-up of panels and a support structure incorporating posts with panels and support posts, extending from floor to ceiling
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/74—Removable non-load-bearing partitions; Partitions with a free upper edge
- E04B2/76—Removable non-load-bearing partitions; Partitions with a free upper edge with framework or posts of metal
- E04B2/78—Removable non-load-bearing partitions; Partitions with a free upper edge with framework or posts of metal characterised by special cross-section of the frame members as far as important for securing wall panels to a framework with or without the help of cover-strips
- E04B2/7854—Removable non-load-bearing partitions; Partitions with a free upper edge with framework or posts of metal characterised by special cross-section of the frame members as far as important for securing wall panels to a framework with or without the help of cover-strips of open profile
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/72—Non-load-bearing walls of elements of relatively thin form with respect to the thickness of the wall
- E04B2/723—Non-load-bearing walls of elements of relatively thin form with respect to the thickness of the wall constituted of gypsum elements
Definitions
- the hollowwall thus ideally constructed is generally characterized by partition members, primarily made from gypsum wallboard or panels, which are positioned adjacent to each other in two parallel spaced-apart opposing rows defining the sides of the wall. The spaced-apart opposing relationship of the sides is accomplished by studs of metal or wood to form the interior of the wall or divider wherein plumbing and electrical conducts are positioned.
- the particular floating stud therein disclosed is H- shaped, requiring both sides of the wall to be assembled simultaneously and progressively from a central point such as a'wall intersection. Disassembly also proceeds from such a central point, as each partition member is interengaged at the two vertical edges thereof with the studs, and each stud is also similarly interengaged with the next adjacent and opposite partition member.
- studs which are metal U-shaped channels the side flanges of which are provided with slots facing outwardly on both sides of the channel.
- the studs extend from the floor to the ceiling in a non-floating manner.
- the panels are individually provided with metal teeth or hooks laminated thereto which must be bent at the time of installation so as to project out from the board towards the side flanges of the studs.
- Each panel then can be assembled and disassembled from two studs by lifting the hooks of the panel into the appropriate slots on the 0 studs.
- the studs each support both sides formed by these panels, as well as adjacent pairs in each side.
- each stud to support both a pair of adjacent panels and the opposite pair of panels forming the other side of the wall. Because of this structure, sound attenuation is not improved over conventional structures, and more importantly, each panel must be made with exact tolerances to avoid unattractive gaps forming at the joints. These gaps can be covered, if at all, only by battens which themselves are decoratively unappealing. Further, to support two adjacent panels on each side, the studs must have considerable lateral extent in the channel walls. This lateral extent weakens the channel causing permanent inward deflection in some cases during installation, which in turn causes lipping" of the panels. i
- Still another problem created by the attempted solution described above is that security is lacking by the very nature of the accessibility of the panels on both sides of the wall. That is, if both sides of the wall are constructed by such a partition assembly, a person can move from room to room merely by dismounting the panels on both sides of the hollow wall.
- This problem can be overcome by providing for a separate construction of one side of the hollow wall, but to provide entirely different components such as different types of panels for such a wall normally results in yet a further complicated assembly and the added cost of extra tooling.
- the former comprising a non-progressive row construction while the latter comprises a progressive row construction.
- the C- shaped studs which are used therefore require that all of the members of that row be independently accessible, whether they need to be or not.
- This application concerns an improved stud and demountable partition assembly or wall utilizing this stud, wherein only one member of a row need be made independently accessible, the remaining members being progressively assembled and disassembled More specifically, there is provided a stud which is improved so as to have means for interengaging at least one stud with only one member of a row, this means being spaced apart a prescribed distance from conventional means on the stud for interengaging two adjacent members in the other row. To insure the one-member interengagement, this distance exceeds the distance between the backs of the partition members defining the opposing rows. The result is that the partition member which is erected adjacent to the one partition member is not connected in any way to the one stud, thereby making that partition member independently accessible.
- FIG. 1 is a fragmentary plan view in section of a demountable wall constructed in accordance with the teachings of prior art
- FIG. 2 is a'fragmentary plan view in section of a demountable wall constructed in accordance with the invention
- FIG. 3 is a fragmentary elevational view in section of the wall in FIG. 2, taken generally along line III-Ill;
- FIG. 4 is a sectional view of a modified form of the stud shown in FIGS. 2 and 3;
- FIG. 5 is a fragmentary plan view in section similar to FIG. 2, but illustrating the stud embodiment shown in FIG.4.
- Partition member refers to a one-piece part of one side or row of a hollow wall or divider which separates a space such as a room from the interior of the wall or divider formed when the member is assembled with other like members.
- a partition member can be a single wall panel having the necessary structure for interengagement with the studs, or it can be two panels adhered or laminated together in a conventional fashion, such as is taught in the aforesaid US. Pat. No. 3,027,605.
- Interengagement and the corresponding verb forms refer to a connecting relationship between two parts, both of those parts being especially made for the relationship.
- Opposing rows or sides of such partition members refers to the two rows of such members spaced apart back-toback which form the completed hollow wall.
- An opposite member is that partition member in the opposite row from the row being discussed which is immediately opposite the partition member in question.
- the back surface of such a partition member is the surface facing away from the exposed, generally decorated, front surface.
- Vertical and horizontal edges of a partition member refers to edges having such orientation when assembled, and which are constructed for that purpose.
- the components and the assembly of the invention can be utilized to construct a hollow wall or partition 20 comprising two spaced apart, back-to-back parallel sides or rows 22 and 24 of partition members 40.
- partition members when assembled, abut against or are confined within, in a conventional manner, floor and ceiling runners 26 and 28, respectively (FIG. 3).
- screws 30 can be utilized to fix the bottom horizontal edges 42 of the partition members in place, a base and attachment clip 32 or a single top set" base 34 being used to cover the screws.
- the spacing of the two rows 22 and 24 is accomplished by studs as hereinafter described.
- the individual partition members 40 can be conventional gypsum wallboard panels of any convenient width or height, having horizontal edges 42 and vertical edges 44.
- the latter edges 44 are conventionally formed with groove-like kerfs 46 extending approximately centrally thereinto, generally parallel to the plane of the member 40 as defined by its surfaces 48 and 50.
- the front surfaces 48 of a member 40 may be decorated in any fashion, such as with a vinyl covering.
- the back surface 50 is generally left undecorated and is of slightly lesser lateral extent or width than the front surface 48, so as to taper the edges 44 inwardly from front to back (FIG. 1).
- the partition members preferably are formed from monolithic hard-edged fiber-glass-reinforced gypsum wallboard.
- laminated panels can also comprise the members 40.
- FIG. 1 illustrates the prior art use of studs 56, a and 60b.
- Stud 56 is used, as disclosed in the aforesaid US. Pat. No. 3,027,605, to provide for a progressive erection of both rows 22 and 24, the end flanges 58 being interengaged with the kerfs 46 of the partition members.
- Back support tabs 59 are used to reinforce the back surface 50 of the members 40.
- studs 60a and 60b permit as disclosed in the aforesaid patent application Ser. No. 77,997, the erection of this portion of rows 22 and 24 completely independent of each other.
- the subscripts a and b are used to distinguish the two types from each other. More specifically, studs 60a and 60b are especially constructed to permit either row 22 or 24 to be assembled or disassembled without affecting and without regard to the studs or members forming the other of the two sides 24 or 22.
- the studs 60a and b interengaged in either row 22 or 24 are spaced without regard to the spacing of the studs interengaged with the other row, and are spaced only with respect to the next adjacent stud in that row as determined by the width of the partition member therebetween. Such a construction is rendered easier by making the studs preferably floating studs. Because the positioning of each stud depends only on the width of the preceding partition member without regard for the width or spacing of opposite partition members, each of the partition members 40 forms an edge 44a-toedge 44a joint with its adjacent neighbors. The joints of the two sides or rows can be nonopposing, as they are formed independently of each other.
- the stud 60a permits only progressive assembly and disassembly of its row.
- Two tongue-like flanges 66a and 68a extend in opposite directions from a web portion 620 of the stud 60a and generally perpendicular thereto, preferably along the entire edge of the stud.
- Flanges 66a and 68a are dimensioned in thickness to snugly fit within the groove-like kerfs 46. This tongueand-groove fit is such that friction retains the studs 60a and 60b in a floating position with the partition members 40, even when the latter are disassembled for repair, alteration, or other purposes.
- each stud 60a is provided with at least one pair of knock-out back tabs 70a, the tabs in each pair projecting in opposite directions and generally parallel to the flanges 66a and 68a, from the web portion.
- the tabs can be replaced by full length flanges. The surface of the tabs fits flush against the back surface 50 of the interengaged member 40.
- the studs 60b in addition to having the single-row interengaging feature of studs 60a, permit individual or selective accessibility to the partition members mounted thereby. This is accomplished by forming the stud 60b with a central web portion 62b and a single end flange 68b for interengagement with a kerf 46 of only one partition member 40. Back tabs 70b are formed and used in the same fashion as the tabs 70a in the studs 60a.
- Both the studs 60a and 60b are characterized by a single flange 72a and 72b, respectively, along the edge of the web portion which is opposite to the flanges 68a and 68b.
- the flanges 72a and 72h are especially designed for a non-interengaging contact with the back surfaces 50 of the partition members to horizontally reinforce them without attaching to them.
- the cavity wall 20 is modified so that only a partition member 40' of either row which must be selectively accessible, is so erected.
- the particular member 40 is part of row 22.
- edge of web 101 opposite edge 110 is pro vided withtwo oppositely extending flanges 102 and 104. These extend from the web generally perpendicularly thereto for progressive assembly within the kerfs of member 40 of row 24, in a manner similar to the prior art construction described earlier.
- edge 1 10 is characterized by a single flange 1 l2 dimensioned and formed so as to interengage the edge of only member 40" within the kerf 46 thereof.
- Flange 112 is spaced from flange 104 a distance which exceeds the back to-back spacing of the partition members 40 and 40", to insure that flanges 104 and 1 12 will interengage with the kerfs of the members.
- back-up support tabs and 122 are bent out of the web. These tabs project parallel to the flanges 104 and 112 respectively, and are spaced from their respective flanges a distance which will accommodate a portion of the back surfaceSO of the partition member resting against the tab. Although only one each tab is shown per stud, any number of them may be used. Alternatively, the tabs 120 and 122 can be replaced by a full-length flange, in which case such a flange must be roll-formed or extruded. It even may be possible in: some cases to omit the tabs where horizontally-directed forces against the wall are expected to be light.
- the studs can be fabricated from any suitable material, such as steel, aluminum, and high strength plastics.
- the accessible member 40' is not an end or corner member, it is necessary to have a second stud 100 mounting in row 22 only, a second one member 40" on the opposite side of member 40.
- a stud is identical to the first described stud 100, and isinstalled so as to appear can be progressively constructed by use of the aforedescribed studs 56.
- the invention has been described in c0nnection with a preferred embodiment, it is not limited thereto.
- the particular shape of the studs 100 need not be exactly as shown, the only limitation being that the studs and partition members adjacent to the partition member which is to be made accessible, be interengaged in such a way as to permit the accessible member to be mounted entirely independently thereof, the studs still providing progressive interengagement with the partition members in the opposite row.
- FIGS. 4 and 5 A specific example of a variation within the scope of the invention is illustrated in FIGS. 4 and 5. Parts similar to those previously described bear the same reference numerals to which the distinguishing suffix a has been added.
- stud 100a is similar to stud 100 described above in that web 101a has, at one edge, flanges 102a and 104a, a tab 120a projecting parallel to flange 104a, and at the other edge 11011, a flange 112a for interengagement with a partition member 40"a (FIG. and a support tab 122a.
- yet another back-up support tab 140 is bent out of the web portion to extend from the side of the web which is opposite to the side from which extends tab 120a.
- tab 140 reinforces the partition member interengaged with flanges 102a by accommodating the back surface of that member. If a stud 60b is used to accessibly mount the partition member 40'a (H0. 5), then the flange 72b thereof can abut against the flange 140.
- a demountable partition assembly including a plurality of demountable partition members and studs removably interengaging the members so as to form two generally straight rows of the members positioned back-to-back and spaced apart a given distance, thereby defining a cavity wall, said studs including a first type positioned between two coplanar, adjacent members in at least one row and having a supporting web portion and means for removably interengaging said two adjacent members in said one row; the improvement comprising means spaced from said firstnamed means by a distance which exceeds said given distance for removably interengaging the first type of stud with only a first one other of said members in the other row, said one member being spaced away from and generally opposite to one of the other members interengaged by said two-member interengaging means, and a second of said partition members accessibly mounted adjacent tosaid other row member by a second type of said studs mounted adjacent, but not connected, to said first type of stud, whereby said second member and said second studs
- said one-member interengaging means includes a single flange extending generally perpendicularly from said web portion.
- said one-member interengaging means includes a groove extending vertically along at least a portion of a vertical edge of said one member, said groove being dimensioned to accommodate said flange.
- said onemember interengaging means includes a groove extending vertically along at least a portion of a vertical edge of said one member.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
- Connection Of Plates (AREA)
- Finishing Walls (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13610671A | 1971-04-21 | 1971-04-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3729883A true US3729883A (en) | 1973-05-01 |
Family
ID=22471330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00136106A Expired - Lifetime US3729883A (en) | 1971-04-21 | 1971-04-21 | Demountable partition assemblies and the studs therefor |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US3729883A (fr) |
| JP (1) | JPS5544227B1 (fr) |
| BE (1) | BE782497A (fr) |
| BR (1) | BR7202186D0 (fr) |
| CA (1) | CA964428A (fr) |
| DE (1) | DE2219648A1 (fr) |
| FR (1) | FR2134005B1 (fr) |
| GB (1) | GB1384587A (fr) |
| IE (1) | IE36306B1 (fr) |
| IL (1) | IL39085A (fr) |
| NL (1) | NL7205272A (fr) |
| SE (1) | SE390042B (fr) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3859765A (en) * | 1972-09-01 | 1975-01-14 | United States Gypsum Co | Demountable partitions and studs therefor |
| US3866376A (en) * | 1972-10-05 | 1975-02-18 | United States Gypsum Co | Metal clad gypsum walls |
| US4057947A (en) * | 1975-03-17 | 1977-11-15 | Kunimasa Oide | Joining and fixing structure for ceiling boards and panelling |
| US4071995A (en) * | 1972-10-10 | 1978-02-07 | Farmer Melville E | Wall construction member |
| US4397127A (en) * | 1980-09-22 | 1983-08-09 | Donn, Incorporated | Extendable stud for partition walls or the like |
| US4408427A (en) * | 1980-10-03 | 1983-10-11 | Donn Incorporated | Framing system for demountable walls or the like |
| US4443991A (en) * | 1980-10-09 | 1984-04-24 | Donn, Incorporated | Demountable partition structure |
| US4538390A (en) * | 1982-09-30 | 1985-09-03 | Owens-Corning Fiberglas Corporation | Insulation and partition means for existing building |
| US4546584A (en) * | 1983-07-11 | 1985-10-15 | Donn Incorporated | Wall panel system providing resilient joints |
| US5337530A (en) * | 1989-10-13 | 1994-08-16 | Beames Douglas M | Building wall construction |
| US5950385A (en) * | 1998-03-11 | 1999-09-14 | Herren; Thomas R. | Interior shaft wall construction |
| US6357198B1 (en) * | 1998-10-14 | 2002-03-19 | Alstom France S.A. | Method of mounting cladding on a wall of a cabin on a ship |
| US6584739B2 (en) | 2000-03-07 | 2003-07-01 | Maxcess Technologies, Inc. | Applied edge trim |
| US20070151172A1 (en) * | 2004-02-11 | 2007-07-05 | Turco Angelo M | Building assembly component |
| WO2008060230A1 (fr) * | 2006-11-17 | 2008-05-22 | Moelven Eurowand Ab | Système de paroi, panneau de paroi et procédé destiné à construire une paroi |
| US20080196337A1 (en) * | 2007-02-15 | 2008-08-21 | Surowiecki Matt F | Slotted track with double-ply sidewalls |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2190935B (en) * | 1986-05-22 | 1990-02-21 | Bpb Industries Plc | Spacer members for wall or lining structure |
| AT395453B (de) * | 1987-07-30 | 1993-01-25 | Scherrer Peter E | Wandelementanordnung |
| GB9016679D0 (en) * | 1990-07-30 | 1990-09-12 | Gudmundsson Edgar | Wall |
| FI96794C (fi) * | 1992-08-14 | 1996-08-26 | Maekelae Metals Oy | Seinärakenne kasettielementeistä |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2316668A (en) * | 1940-07-01 | 1943-04-13 | James E Bronner | Wall unit assembly |
| FR1149500A (fr) * | 1956-03-30 | 1957-12-26 | Procédé pour la fixation d'éléments de revêtement dans les constructions et dispositifs pour sa mise en oeuvre | |
| US3487598A (en) * | 1966-03-25 | 1970-01-06 | Mcdonalds System Inc | Modular building construction and method |
-
1971
- 1971-04-21 US US00136106A patent/US3729883A/en not_active Expired - Lifetime
-
1972
- 1972-03-27 IL IL39085A patent/IL39085A/xx unknown
- 1972-04-07 CA CA139,204A patent/CA964428A/en not_active Expired
- 1972-04-13 BR BR722186A patent/BR7202186D0/pt unknown
- 1972-04-17 GB GB1768372A patent/GB1384587A/en not_active Expired
- 1972-04-18 IE IE516/72A patent/IE36306B1/xx unknown
- 1972-04-18 JP JP3838772A patent/JPS5544227B1/ja active Pending
- 1972-04-19 NL NL7205272A patent/NL7205272A/xx unknown
- 1972-04-20 SE SE7205183A patent/SE390042B/xx unknown
- 1972-04-21 DE DE19722219648 patent/DE2219648A1/de active Pending
- 1972-04-21 BE BE782497A patent/BE782497A/fr unknown
- 1972-04-21 FR FR7214156A patent/FR2134005B1/fr not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2316668A (en) * | 1940-07-01 | 1943-04-13 | James E Bronner | Wall unit assembly |
| FR1149500A (fr) * | 1956-03-30 | 1957-12-26 | Procédé pour la fixation d'éléments de revêtement dans les constructions et dispositifs pour sa mise en oeuvre | |
| US3487598A (en) * | 1966-03-25 | 1970-01-06 | Mcdonalds System Inc | Modular building construction and method |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3859765A (en) * | 1972-09-01 | 1975-01-14 | United States Gypsum Co | Demountable partitions and studs therefor |
| US3866376A (en) * | 1972-10-05 | 1975-02-18 | United States Gypsum Co | Metal clad gypsum walls |
| US4071995A (en) * | 1972-10-10 | 1978-02-07 | Farmer Melville E | Wall construction member |
| US4057947A (en) * | 1975-03-17 | 1977-11-15 | Kunimasa Oide | Joining and fixing structure for ceiling boards and panelling |
| US4397127A (en) * | 1980-09-22 | 1983-08-09 | Donn, Incorporated | Extendable stud for partition walls or the like |
| US4408427A (en) * | 1980-10-03 | 1983-10-11 | Donn Incorporated | Framing system for demountable walls or the like |
| US4443991A (en) * | 1980-10-09 | 1984-04-24 | Donn, Incorporated | Demountable partition structure |
| US4538390A (en) * | 1982-09-30 | 1985-09-03 | Owens-Corning Fiberglas Corporation | Insulation and partition means for existing building |
| US4546584A (en) * | 1983-07-11 | 1985-10-15 | Donn Incorporated | Wall panel system providing resilient joints |
| US5337530A (en) * | 1989-10-13 | 1994-08-16 | Beames Douglas M | Building wall construction |
| US5950385A (en) * | 1998-03-11 | 1999-09-14 | Herren; Thomas R. | Interior shaft wall construction |
| US6357198B1 (en) * | 1998-10-14 | 2002-03-19 | Alstom France S.A. | Method of mounting cladding on a wall of a cabin on a ship |
| US6584739B2 (en) | 2000-03-07 | 2003-07-01 | Maxcess Technologies, Inc. | Applied edge trim |
| US20070151172A1 (en) * | 2004-02-11 | 2007-07-05 | Turco Angelo M | Building assembly component |
| US7596911B2 (en) * | 2004-02-11 | 2009-10-06 | Hiltive Pty Limited | Building assembly component |
| WO2008060230A1 (fr) * | 2006-11-17 | 2008-05-22 | Moelven Eurowand Ab | Système de paroi, panneau de paroi et procédé destiné à construire une paroi |
| US20080196337A1 (en) * | 2007-02-15 | 2008-08-21 | Surowiecki Matt F | Slotted track with double-ply sidewalls |
| US7735295B2 (en) * | 2007-02-15 | 2010-06-15 | Surowiecki Matt F | Slotted track with double-ply sidewalls |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2134005B1 (fr) | 1975-10-24 |
| IE36306L (en) | 1972-10-21 |
| JPS5544227B1 (fr) | 1980-11-11 |
| NL7205272A (fr) | 1972-10-24 |
| CA964428A (en) | 1975-03-18 |
| IE36306B1 (en) | 1976-09-29 |
| IL39085A0 (en) | 1972-05-30 |
| FR2134005A1 (fr) | 1972-12-01 |
| BR7202186D0 (pt) | 1973-06-14 |
| DE2219648A1 (de) | 1972-12-07 |
| BE782497A (fr) | 1972-08-16 |
| IL39085A (en) | 1974-06-30 |
| GB1384587A (en) | 1975-02-19 |
| SE390042B (sv) | 1976-11-29 |
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