US3678640A - Partition-walls formed of prefabricated elements - Google Patents

Partition-walls formed of prefabricated elements Download PDF

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Publication number
US3678640A
US3678640A US74803A US3678640DA US3678640A US 3678640 A US3678640 A US 3678640A US 74803 A US74803 A US 74803A US 3678640D A US3678640D A US 3678640DA US 3678640 A US3678640 A US 3678640A
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Prior art keywords
building structure
elements
structure according
partition
cavities
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Expired - Lifetime
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US74803A
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English (en)
Inventor
Jean-Claude Tillie
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TRAMEX
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TRAMEX
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/04—Apparatus or processes for treating or working the shaped or preshaped articles for coating or applying engobing layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/02—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material with fibres or particles being present as additives in the layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/06—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions for securing layers together; for attaching the product to another member, e.g. to a support, or to another product, e.g. groove/tongue, interlocking
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/541—Joints substantially without separate connecting elements, e.g. jointing by inter-engagement
    • 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
    • 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
    • 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
    • E04B2/82—Removable non-load-bearing partitions; Partitions with a free upper edge characterised by the manner in which edges are connected to the building; Means therefor; Special details of easily-removable partitions as far as related to the connection with other parts of the building
    • E04B2/821—Connections between two opposed surfaces (i.e. floor and ceiling) by means of a device offering a restraining force acting in the plane of the partition
    • E04B2/822—Elastic connections, e.g. inflated joints
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/043—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of plaster
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E04C2/284—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
    • E04C2/288—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating composed of insulating material and concrete, stone or stone-like material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2607/00—Walls, panels

Definitions

  • the present invention relates to a prefabricated partitionwall element of inter-level height constituted by a parallelepiped-shaped plate.
  • the invention also concerns the various uses of such elements which, by being appropriately shaped, offer multiple possibilities of assembling in vertical, horizontal and all directions.
  • Such assemblies may serve as dividing walls for habitable rooms or for industrial, commercial or ornamental purposes, as well as doubling or ceiling partitions.
  • the present invention is intended to remedy the aforesaid various drawbacks and to afford new advantages.
  • the prefabricated partition-wall element according to the invention is characterized mainly by the fact that it is composed of a rigid and resistant core covered with apparent facings of smooth coatings, the dimensions of which are equal to the largest dimensions of the element, and is provided on its narrow faces and all around its periphery with sunk and raised portions provided in the material of the core and ensuring the binding with the adjacent elements subsequent to interposition of a binder.
  • the said element is strictly identical with the adjacent elements, especially in thickness, and is perfectly adaptable to the walls and floors.
  • the lower portion of the said element is waterproofed by way of steeping.
  • the sunk and raised portions on the narrow faces in the form of parallel grooves on the outer faces and of cavities whose axes are located in the medial plane of the element but are oblique with respect to the said narrow faces.
  • the partitions assembled from the elements defined hereabove are characterized by the fact that the elements are accurately juxtaposed by being keyed, and then a binder is injected between them so as to till the grooves and the cavities and by hardening firmly binds together the various elements of the partition, a malleable product being cast on the side where the keys are located, the said keys thus remaining in place in the mounted partition.
  • the elements In making vertical partitions, the elements, whose height is a little less than that of the wall between the floors, are keyed from underneath so as to be applied at their top and their sides on the adjacent elements, the lower keys being subsequently concealed.
  • FIG. 1 is a perspective view of one angle of an element
  • FIG. 2 is a sectional view along a medial plane parallel with outer faces of an element
  • FIG. 3 is a partial sectional view of a joint between two elements
  • FIG. 4 is an elevational view of a partition constituted by elements according to the invention, during construction
  • H6. 5 is a perspective view of a key prior to installation
  • FIG. 6 is a view in profile of the same key during installation
  • FIG. 7 is a diagrammatic view of the apparatus serving to manufacture the elements according to the invention.
  • the plates 1 constituting the partitioning elements according to the invention are parallelepiped-shaped and their length is relatively great as compared to their width. Where plates serving to make vertical partition-walls are concerned, the length of each element 1 is a little less than the height of a between-floors wall.
  • Each element is composed of a rigid and resistant core covered with apparent facings consisting of smooth coatings 3, 4, the dimensions of which are equal to those of the core 2. 1n the examples illustrated, the surface of the apparent facings 3, 4 is equal to the section of the core 2 in a medial plane parallel with the said facings 3, 4. All along the periphery of the element 1, grooves 5, 6, 7 and cavities or cells 8 are cut in the material of the core 2 on the narrow face of the element 1. In the example illustrated on FIG.
  • the grooves 5 and 6 are semi-cylindrical in section whereas groove 7 is triangular in section but the grooves may have any section whatsoever.
  • the grooves 5, 6 are parallel with the outer edges of the element 1.
  • the cavities 8 have their axes located in the medial plane of the element. The axes of the cavities 8 are oblique with respect to the surface of the narrow faces of the element. It has been found advantageous to so arrange the cavities 8 that their axes are inclined obliquely, alternatively in 4 one direction and the other; the inclination of the cavity axis is of the order of approximately from 30' to 45.
  • the core 2 is made from a conglomerate of plaster reinforced with straw, while the apparent facings 3, 4 are made from compact, polished and calibrated plaster. Indeed, the dimensions of the various elements are respectively strictly identical.
  • the core is not compulsorily made from plaster reinforced with straw. It has also been found advantageous to make the core from expanded and reinforced polysterol. Other materials may also be used provided they ensure the required res'mtance and their cost is not too high.
  • a fluid binder is injected under pressure into the joints from the bottom and fills the grooves 5, 6, 7 and the cavities 8.
  • a very strong cement glue may be selected as a binder.
  • the said binder hardens, it firmly binds the various elements of the partition-wall to one another and to the adjacent walls of the structure. The binding takes place at the level of the core 2, not at the level of the facings 3, 4 which do not partake in resistance and which, therefore. do not tend to crack subsequently.
  • the arrangement of the cavities 8 inclined alternatively in one direction and the other increues the cohesion of both elements held together by a cement glue joint, the shape of which recalls that of a fish-bone.
  • the binding to the walls l2, 13 of the structure is also ensured by the cement glue. if necessary. grooves and cavities may be cut in the walls 12 and 13.
  • the binding of the partition-wall portion located on the side of the keys 9 to the corresponding wall 14 of the structure is achieved by filling the space comprised between the partition wall and the wall l4 with a plastic material which is cast between the keys.
  • This material may be cement, plaster or any other synthetic material.
  • the prefabrication of the elements I is carried out at the factory on the machine diagrammatized in FIG. 7.
  • the special plaster and treated straw mixture l serving to make the core 2 is poured into the hopper 16 which distributes the same onto the conveyor band 17.
  • the mixture may be compressed and pushed onto the band 17 which conveys it towards the die 20.
  • the die 20 may have a plane surface to which a reciprocating motion is imparted in order to suitably flatten and size the element.
  • the setting and hardening time of the plaster is reduced by way of heating or by means of an accelerating or hardening admixture.
  • Grooves 5, 6, 7 and cavities B are imprinted by means of dies and pins or studs on the narrow faces of the elements at the level of the die 20.
  • a severing device (not shown) which is so adjusted as to enable to obtain elements or boards having an accurately predetermined length; as a rule, the length of the vertical partition-walls is a little less than one interlevel height.
  • the rough and rugose element thus formed is automatically conveyed and arranged onto a marble member 21 where it receives the desired coating on one or both faces to form the facing or facings 3 and 4.
  • a series of similar and readily adjustable marble members having the selected dimensions in length as well as in thickness is provided on the side of the die 20 to receive the elements. The rotating speed of the marble members is calculated according to the setting and hardening time of the selected coating or coatings.
  • the element 1 constituted by a core 2 coated with facings 3 and 4 is then subjected to a die treatment a second time in order to be imparted quite definite dimensional characteristics, especially in thickness for which the tolerance is a few hundredths of a millimeter.
  • the die 22 used to this end achieves a smoothing and a hardening of the faces which are to remain apparent. A so-called cut, "smoo or alumed" plaster is thus obtained depending on the choice made by the user or the architect.
  • the elements thus obtained have a constant width and a strictly observed thickness. Their width may be readily adapted on the site by way of sawing according to the dimension of the element. The sawing may be replaced by any other cutting operation.
  • the element leaving the die 22 is pushed onto a table 23 on which it may be straightened by a straightening device 24 as soon as it leaves the die. or it may receive coatings such as finish papers, etc.
  • finish papers the face or faces to be treated are printed at each edge with a cove or the like, so that the calico to be stuck on the site will not result in extra-thickness.
  • the elements covered with the coating are conveyed automatically and vertically to a drying device and a store.
  • An insulating operation at the capillary rise of the unit may possibly be performed by making the foot of the element I pass through a constant-level tank filled with a dampor water-proofing liquid.
  • the elements in the dry state are arranged side by side and retained in a vertical plane, for instance by means of a set of rules, and they are joined to the ceiling through the medium of sunk or embedded steel lyres such as those illustrated in FIGS. 5 and 6 and the use of which has already been described. Thereafter, cement glue is injected into the joints from the bottom of the elements into the channels formed by the grooves 5, 7.
  • the last operation consists in casting a plastic material from the side where the partition-wall is keyed, for instance at the bottom between the keys 9 in case of a vertical partition-wall.
  • the elements according to the invention, the use thereof and the partition-walls obtained therewith offer a great number of advantages. They enable to make prefabricated partition-wall elements of inter-level height, made or not from conventional materials and affording, by being appropriately shaped, multiple possibilities of assemblies in vertical, horizontal and all directions, and serving to form division walls for habitable rooms or for industrial, commercial or simply ornamental purpose. It also enables to make doubling or doubleceiling partitions. The jointing of the elements on the site enables to replace all the working operations in their conventional form.
  • the special features of the assembly are advantageous not only owing to the manner in which the uncrackable head joint under the ceiling is designed and carried out, but also owing to the vertical joint being designed and carried out in an original manner, i.e. owing to the particular arrangement of the grooves 5, 6, 7 and the cavities 8 dissociating an applied force into various components.
  • the grooves and cavities result in an increase in cohesion after the binding of the elements to one another subsequent to the drying of the special injected cement glue.
  • the elements may be fabricated from a great variety of conventional and new materials for the resistant core as well as the apparent facings. Such variety enables to take advantage of the apparent density of the complex thus constituted. Moreover, completely automated fabrication of the elements may be obtained, and since the fabrication is rapid it enables to comply with every requirement without having to keep im portant stocks. It should not be forgotten that the height of the lower horizontal joint in the case of a vertical partition-wall may vary within extensive limits, so that elements of one and the same size may be used to form partition-walls of various heights. The partition-walls may be made to measure from standard elements.
  • partition-wall is of interest in that it enables in particular to takeadvantage of phenomena which were up to the present considered to be a major hindrance in other proposed types of partition-walls.
  • a building structure comprising at least two prefabricated partition-wall elements each comprising a parallele piped-shaped core member made of a rigid and resistant material, said core member having two rectangular main faces parallel to each other and peripheral narrow faces and at least one rectangular coating member covering one at least of said rectangular main faces and forming an apparent smooth facing for the same, said peripheral narrow faces being provided with grooves and cavities, said partition-wall elements being accurately juxtaposed along their respective narrow faces so that grooves and cavities on the narrow face of one element registers with grooves and cavities on the narrow face of the other element and being bound with one another, at the level of said core members, by a binder injected under pressure between said juxtaposed narrow faces so as to fill the said grooves and cavities, said elements bearing upon the floor, the ceiling and any other backing structure through the medium of resilient key means, a plastic material being cast on the side of said building structure where the said key means are located the said key means remaining in place in said building structure.
  • a building structure according to claim I wherein said grooves provided in narrow faces have a triangular cross-sec- 6.
  • a building structure according to claim I wherein said cavities are inclined obliquely with respect to said peripheral narrow faces.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Building Environments (AREA)
  • Laminated Bodies (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Cartons (AREA)
  • Finishing Walls (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US74803A 1969-09-25 1970-09-23 Partition-walls formed of prefabricated elements Expired - Lifetime US3678640A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6932656A FR2058767A5 (de) 1969-09-25 1969-09-25

Publications (1)

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US3678640A true US3678640A (en) 1972-07-25

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US74803A Expired - Lifetime US3678640A (en) 1969-09-25 1970-09-23 Partition-walls formed of prefabricated elements

Country Status (14)

Country Link
US (1) US3678640A (de)
AT (1) AT307677B (de)
BE (1) BE756577A (de)
CH (1) CH536411A (de)
DE (1) DE2046893A1 (de)
ES (1) ES196007Y (de)
FI (1) FI50171C (de)
FR (1) FR2058767A5 (de)
GB (1) GB1323760A (de)
IE (1) IE34592B1 (de)
IL (1) IL35349A (de)
LU (1) LU61770A1 (de)
NL (1) NL7014199A (de)
ZA (1) ZA706521B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015387A (en) * 1973-08-30 1977-04-05 Tramex S.A. Prefabricated structural elements for partitions and walls of buildings and partitions and walls consisting of such elements
US20050055935A1 (en) * 2003-08-19 2005-03-17 Layfield Derek J. Interior wall and partition construction

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3704276A1 (de) * 1987-02-12 1988-08-25 Goldbach Gmbh Holz Verfahren zum befestigen von umleimern an den kanten von bauplatten aus mineralischem material
CN110469042B (zh) * 2019-07-31 2021-04-06 东南大学 一种装配式预制墙板、其制造方法及其模具
CN111516116B (zh) * 2020-05-06 2021-06-01 孙秀杰 一种蒸压加气混凝土条板免粘连的工艺及装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US528636A (en) * 1894-11-06 Lambert kupper
CH13092A (de) * 1897-01-25 1897-08-31 Joseph Ruhrig Plattenwand
FR63154E (fr) * 1952-07-22 1955-08-25 Procédé et dispositif pour la fabrication de plafonds et de cloisons en éléments préfabriqués
US2838144A (en) * 1948-11-23 1958-06-10 Macdonald Angus Snead Metal planks
US3145504A (en) * 1961-03-24 1964-08-25 Butler Manufacturing Co Wall panel and interlocking joint construction
US3389517A (en) * 1965-06-30 1968-06-25 Weyerhaeuser Co Installation method for partitions

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US528636A (en) * 1894-11-06 Lambert kupper
CH13092A (de) * 1897-01-25 1897-08-31 Joseph Ruhrig Plattenwand
US2838144A (en) * 1948-11-23 1958-06-10 Macdonald Angus Snead Metal planks
FR63154E (fr) * 1952-07-22 1955-08-25 Procédé et dispositif pour la fabrication de plafonds et de cloisons en éléments préfabriqués
US3145504A (en) * 1961-03-24 1964-08-25 Butler Manufacturing Co Wall panel and interlocking joint construction
US3389517A (en) * 1965-06-30 1968-06-25 Weyerhaeuser Co Installation method for partitions

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015387A (en) * 1973-08-30 1977-04-05 Tramex S.A. Prefabricated structural elements for partitions and walls of buildings and partitions and walls consisting of such elements
US20050055935A1 (en) * 2003-08-19 2005-03-17 Layfield Derek J. Interior wall and partition construction
US20060026925A1 (en) * 2003-08-19 2006-02-09 Layfield Derek J Interior wall and partition construction
US20060037282A1 (en) * 2003-08-19 2006-02-23 Layfield Derek J Interior wall and partition construction
US7032356B2 (en) * 2003-08-19 2006-04-25 Layfield Derek J Interior wall and partition construction
US7127858B2 (en) * 2003-08-19 2006-10-31 Strawmen, L.P. Interior wall and partition construction

Also Published As

Publication number Publication date
IL35349A (en) 1973-05-31
ZA706521B (en) 1971-04-28
DE2046893A1 (de) 1971-04-22
GB1323760A (en) 1973-07-18
ES196007Y (es) 1975-07-01
IE34592B1 (en) 1975-06-25
FR2058767A5 (de) 1971-05-28
AT307677B (de) 1973-06-12
IE34592L (en) 1971-03-25
ES196007U (es) 1975-03-01
BE756577A (fr) 1971-03-01
CH536411A (fr) 1973-04-30
NL7014199A (de) 1971-03-29
FI50171B (de) 1975-09-01
LU61770A1 (de) 1971-01-18
IL35349A0 (en) 1970-11-30
FI50171C (fi) 1975-12-10

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