CA1057185A - Embossed laminated sheet material with polypropylene film - Google Patents
Embossed laminated sheet material with polypropylene filmInfo
- Publication number
- CA1057185A CA1057185A CA200,807A CA200807A CA1057185A CA 1057185 A CA1057185 A CA 1057185A CA 200807 A CA200807 A CA 200807A CA 1057185 A CA1057185 A CA 1057185A
- Authority
- CA
- Canada
- Prior art keywords
- polypropylene film
- sheet material
- embossed
- sheet
- polypropylene
- 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
Links
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 27
- -1 polypropylene Polymers 0.000 title claims abstract description 24
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 title claims abstract description 16
- 239000003351 stiffener Substances 0.000 claims abstract description 5
- 239000012769 display material Substances 0.000 claims abstract description 4
- 238000004049 embossing Methods 0.000 claims description 10
- 239000010408 film Substances 0.000 description 25
- 229920003023 plastic Polymers 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard 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
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D3/00—Book covers
- B42D3/002—Covers or strips provided with adhesive for binding
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin 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
- 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
- B32B3/04—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 characterised by at least one layer folded at the edge, e.g. over another layer ; characterised by at least one layer enveloping or enclosing a 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/06—Embossing
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/02—2 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
- B32B2250/00—Layers arrangement
- B32B2250/03—3 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/554—Wear resistance
-
- 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
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
Landscapes
- Laminated Bodies (AREA)
- Sheet Holders (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Peptides Or Proteins (AREA)
Abstract
EMBOSSED LAMINATED SHEET MATERIAL WITH POLYPROPYLENE FILM
ABSTRACT OF THE DISCLOSURE
An embossed laminated sheet material for folders, showcards and display materials comprises a decorative paper sheet coated with a transparent polypropylene film of a weight as low as 20 gm/m2. The laminated sheet material is mounted on a stiffener commonly used in bookbinding with the polypropylene film being outermost.
ABSTRACT OF THE DISCLOSURE
An embossed laminated sheet material for folders, showcards and display materials comprises a decorative paper sheet coated with a transparent polypropylene film of a weight as low as 20 gm/m2. The laminated sheet material is mounted on a stiffener commonly used in bookbinding with the polypropylene film being outermost.
Description
1 This invention relates to laminated sheet material for use in the manufacture of folders, showcards, display materials and the like made from a stiff insert of bookbinding material such as cardboard with a plas~ic covering.
The invention for example, relates to folders, particularly sample, advertising, or quotation folders, For use as folders it is known to cover a stiff insert with a polyvinyl chloride coating on both sides, and to weld the coating at the edges. Plastic folders of this kind are in themselves very wear resistant, but they do not have an at~active appearance. Although their surface can be improved by embossing the printing, nevertheless the printing is restricted to relatively large characters and coarsely drawn stylised illustrations. The printing may be done in colour, but hitherto was possible only in pale shades having poor luminosityO If on the other hand it is desired to provide plastic.folders of this kind on the outside with sharply defined, strongly coloured pictures possessing good luminosity, for example with advertising photographs, this was possible hitherto only by welding insertion pockets of transparent plastic film on the outside of the plastic folder and inserting the desired prints into the pockets. Folders of this kind, however, give an impression of poor quality which is not suitable for high class advertising and presentation.
Folders are also known in which a sheet consisting of a print coated with a smooth acetate film is mounted on the stiff insertO Although folders of this kind can be printed in strong colours, the smooth acetate film results in disturbing reflections and is also not very wear resistant. After being in use for a short time it becomes damaged in places and consequently loses its 30 originally pleasing appearanceO ~
~S7185 1 The aim of the present invention is to provide wear-resistant materials for use for example in folders, showcards, display materials and the like which have a high quality and pleasing appearance, and which completely complies with the versatile and strict demands of modern advertising and presentation.
To this end according to the invention a laminated material comprising a decorative sheet coated with embossed polypropylene film is mounted on at least one face of a stiffener of the kind commonly used in bookbinding.
The decorative sheet can take many forms and in the context of the present invention is meant to include any sheet the desired appearance of which is required to be seen through the polypropylene. Thus the sheet can be printed material applied by any of the conventional printing methods, extracts from newspapers, journals, catalogues and the like, bottle labels, photographs and so on. It can be merely a sheet in one or more colours.
Thus according to the invention, a folder is achieved by laminating a decorative sheet such as printed sheet which is laminated with an embossed polypropylene film mounting it on the outside of an insert and drawing the laminate over the edges of the insert on all sides and onto the inner side of the insert.
The wearing properties of a folder showcard or display of this kind are ensured by the use of a polypropylene film the high breaking strength, impact strength, and scratch resistance of which permanently protect the surfaces of the Eolders. The poly-propylene film is preferably thin and is embossed conjointly with the printed sheet. A thin film does not reduce the brilliance of the sheet covered by it, but on the other hand is still strong enough to permit its use even with printed sheets of very weak material.
Durability and transparency are particularly effectively combined ~B 2 -~57~35 1 in a propylene film the weight per unit area of which amounts to 20 g per m . With a film of this kind it is even immediately possible to use newsprint, cuttings from newspapers or catalogues, bottle labels, and the like, so that in principle the production of special printed sheets for the folders is not necessary. The unrestricted choice of the nature of the prints to be used permits extremely varied types of folders and gives the advertising specialist a completely free hand in the choice of his design means, while at the same time it is possible to use existing printed sheets, which in certain circumstances means a considerable saving of moneyO
The embossing of the laminated sheet leads to a reduction Gf light reflection as compared with a smooth glossy film covering, and thus leads to a more handsome and more attractive appearance of the covered folders. At the same time, the feel is improved by the embossingO In comparison with known folders, the new folders constitute a particular improvement in respect of the combination of good wearing properties and the permitting of outstanding, vers-atile aesthetic design.
It is expedient for a sheet which is laminated and con jointly embossed with a polypropylene film to be mounted on the inside of the insert of the novel folders, this sheet covering the edges of the sheet mounted on the outside. The inner faces of the folders are thus also given an att~active, wear-resistant surface The inner faces of the folders may simply be made white, but in special cases the sheet mounted on the inner side of the insert may advantageously be printed with text or pattern, or of a single colour.
Alternately, the polypropylene film may also be embossed 3C alone and then laminated with the printed sheetO In this case, iOS7185 1 however a higher weight per unit area of the polypropylene film, of the order of 100 grams per m , is necessary in order to achieve permanent embossing. Such thick films however, frequently do not have the same good transparency as thinner films, so that a col-oured print covered by the film loses in brilliance in comparisonwith a thin polypropylene film. If however, a thick film is available the transparency of which is equal to that of a poly-propylene film of a weight per unit area of 20 grams per m , good results can then also be achieved with a pre-embossed film.
The invention is described below with reference to drawings, in which:
Figure 1 shows diagrammatically a printed sheet covered by a polypropylene film, before embossing;
Figure 2 shows the same printed sheet as in Figure 1, coated with a polypropylene film, after the conjointly effected embossing; and Figure 3 shows diagrammatically the construction of a folder with the coated printed sheet mounted and suitable for use in a loose leaf binder.
Referring to the drawings the printed sheet 1 may consist of any desired paper material, even very thin material. It may have any desired designs and be printed in black and white, in one colour, or in a plurality of colours. Its strength is acquired by coating with a thin, clear polypropylene film, which preferably has a weight per unit area of 20 grams per m .
After the printed sheet has been coated with the poly-propylene film, the resulting coated sheet 4 (Figure 2) is provided with embossing, which affects both the printed sheet 1 and the polypropylene film 20 Although the polypropylene film is very thin, the embossing is nevertheless very durable because the printed 1~57~85 1 sheet 1 is simultaneously embossed. Good aesthetic results and a good feel are achieved by embossing which imparts to the sheét 4 a structure similar to woven line~O The depressions produced by embossing in the sheet 4 are designated 3 in Figure 2.
The coated, embossed sheet 4 is adhesively bonded on a stiff insert 5(Figure 3), preferably made of cardboard, for the purpose of producing the folder. The sheet 4 covers at least the outer faces of the folder and is drawn a certain distance over the edge 8 of the latter and onto the inner face 7. However, the inner faces 7 are also preferably covered completely by a coatedJ
embossed sheetO
The invention for example, relates to folders, particularly sample, advertising, or quotation folders, For use as folders it is known to cover a stiff insert with a polyvinyl chloride coating on both sides, and to weld the coating at the edges. Plastic folders of this kind are in themselves very wear resistant, but they do not have an at~active appearance. Although their surface can be improved by embossing the printing, nevertheless the printing is restricted to relatively large characters and coarsely drawn stylised illustrations. The printing may be done in colour, but hitherto was possible only in pale shades having poor luminosityO If on the other hand it is desired to provide plastic.folders of this kind on the outside with sharply defined, strongly coloured pictures possessing good luminosity, for example with advertising photographs, this was possible hitherto only by welding insertion pockets of transparent plastic film on the outside of the plastic folder and inserting the desired prints into the pockets. Folders of this kind, however, give an impression of poor quality which is not suitable for high class advertising and presentation.
Folders are also known in which a sheet consisting of a print coated with a smooth acetate film is mounted on the stiff insertO Although folders of this kind can be printed in strong colours, the smooth acetate film results in disturbing reflections and is also not very wear resistant. After being in use for a short time it becomes damaged in places and consequently loses its 30 originally pleasing appearanceO ~
~S7185 1 The aim of the present invention is to provide wear-resistant materials for use for example in folders, showcards, display materials and the like which have a high quality and pleasing appearance, and which completely complies with the versatile and strict demands of modern advertising and presentation.
To this end according to the invention a laminated material comprising a decorative sheet coated with embossed polypropylene film is mounted on at least one face of a stiffener of the kind commonly used in bookbinding.
The decorative sheet can take many forms and in the context of the present invention is meant to include any sheet the desired appearance of which is required to be seen through the polypropylene. Thus the sheet can be printed material applied by any of the conventional printing methods, extracts from newspapers, journals, catalogues and the like, bottle labels, photographs and so on. It can be merely a sheet in one or more colours.
Thus according to the invention, a folder is achieved by laminating a decorative sheet such as printed sheet which is laminated with an embossed polypropylene film mounting it on the outside of an insert and drawing the laminate over the edges of the insert on all sides and onto the inner side of the insert.
The wearing properties of a folder showcard or display of this kind are ensured by the use of a polypropylene film the high breaking strength, impact strength, and scratch resistance of which permanently protect the surfaces of the Eolders. The poly-propylene film is preferably thin and is embossed conjointly with the printed sheet. A thin film does not reduce the brilliance of the sheet covered by it, but on the other hand is still strong enough to permit its use even with printed sheets of very weak material.
Durability and transparency are particularly effectively combined ~B 2 -~57~35 1 in a propylene film the weight per unit area of which amounts to 20 g per m . With a film of this kind it is even immediately possible to use newsprint, cuttings from newspapers or catalogues, bottle labels, and the like, so that in principle the production of special printed sheets for the folders is not necessary. The unrestricted choice of the nature of the prints to be used permits extremely varied types of folders and gives the advertising specialist a completely free hand in the choice of his design means, while at the same time it is possible to use existing printed sheets, which in certain circumstances means a considerable saving of moneyO
The embossing of the laminated sheet leads to a reduction Gf light reflection as compared with a smooth glossy film covering, and thus leads to a more handsome and more attractive appearance of the covered folders. At the same time, the feel is improved by the embossingO In comparison with known folders, the new folders constitute a particular improvement in respect of the combination of good wearing properties and the permitting of outstanding, vers-atile aesthetic design.
It is expedient for a sheet which is laminated and con jointly embossed with a polypropylene film to be mounted on the inside of the insert of the novel folders, this sheet covering the edges of the sheet mounted on the outside. The inner faces of the folders are thus also given an att~active, wear-resistant surface The inner faces of the folders may simply be made white, but in special cases the sheet mounted on the inner side of the insert may advantageously be printed with text or pattern, or of a single colour.
Alternately, the polypropylene film may also be embossed 3C alone and then laminated with the printed sheetO In this case, iOS7185 1 however a higher weight per unit area of the polypropylene film, of the order of 100 grams per m , is necessary in order to achieve permanent embossing. Such thick films however, frequently do not have the same good transparency as thinner films, so that a col-oured print covered by the film loses in brilliance in comparisonwith a thin polypropylene film. If however, a thick film is available the transparency of which is equal to that of a poly-propylene film of a weight per unit area of 20 grams per m , good results can then also be achieved with a pre-embossed film.
The invention is described below with reference to drawings, in which:
Figure 1 shows diagrammatically a printed sheet covered by a polypropylene film, before embossing;
Figure 2 shows the same printed sheet as in Figure 1, coated with a polypropylene film, after the conjointly effected embossing; and Figure 3 shows diagrammatically the construction of a folder with the coated printed sheet mounted and suitable for use in a loose leaf binder.
Referring to the drawings the printed sheet 1 may consist of any desired paper material, even very thin material. It may have any desired designs and be printed in black and white, in one colour, or in a plurality of colours. Its strength is acquired by coating with a thin, clear polypropylene film, which preferably has a weight per unit area of 20 grams per m .
After the printed sheet has been coated with the poly-propylene film, the resulting coated sheet 4 (Figure 2) is provided with embossing, which affects both the printed sheet 1 and the polypropylene film 20 Although the polypropylene film is very thin, the embossing is nevertheless very durable because the printed 1~57~85 1 sheet 1 is simultaneously embossed. Good aesthetic results and a good feel are achieved by embossing which imparts to the sheét 4 a structure similar to woven line~O The depressions produced by embossing in the sheet 4 are designated 3 in Figure 2.
The coated, embossed sheet 4 is adhesively bonded on a stiff insert 5(Figure 3), preferably made of cardboard, for the purpose of producing the folder. The sheet 4 covers at least the outer faces of the folder and is drawn a certain distance over the edge 8 of the latter and onto the inner face 7. However, the inner faces 7 are also preferably covered completely by a coatedJ
embossed sheetO
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An embossed sheet material suitable for use in folders, showcards and display material wherein a decorative paper sheet is laminated or coated with a thin polypropylene film and is mounted on a stiffener of the kind commonly used in bookbinding, with the polypropylene outermost, wherein the decorative sheet and polypropylene film are embossed conjointly.
2. An embossed sheet material according to claim 1, wherein the polypropylene and decorative sheet laminate is folded around the edges of the stiffener.
3. An embossed sheet material according to claim 1, wherein the polypropylene and decorative sheet laminate is mounted on both sides of the stiffener.
4. An embossed sheet material according to claim 1, in which the polypropylene has a weight per unit area of 20 g/m2.
5. An embossed sheet material according to claim 1, in which the embossing of the polypropylene film has a linen-like structure.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19737320711U DE7320711U (en) | 1973-06-02 | 1973-06-02 | FOLDER, IN PARTICULAR SAMPLE, ADVERTISING OR OFFER FOLDER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1057185A true CA1057185A (en) | 1979-06-26 |
Family
ID=6638957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA200,807A Expired CA1057185A (en) | 1973-06-02 | 1974-05-24 | Embossed laminated sheet material with polypropylene film |
Country Status (11)
| Country | Link |
|---|---|
| AT (1) | AT338740B (en) |
| BE (1) | BE814826A (en) |
| CA (1) | CA1057185A (en) |
| DE (1) | DE7320711U (en) |
| DK (1) | DK287174A (en) |
| ES (1) | ES199845Y (en) |
| FR (1) | FR2232027B1 (en) |
| GB (1) | GB1470835A (en) |
| NL (1) | NL7405499A (en) |
| NO (1) | NO143418C (en) |
| SE (1) | SE417807B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4092638A1 (en) * | 1990-07-13 | 1993-06-03 | Folder having environmentally friendly burning characteristics |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE809074C (en) * | 1949-08-30 | 1951-07-23 | Vier Tannen Verlag Schneider & | Book cover |
| BE606510A (en) * | 1960-07-28 | 1900-01-01 | ||
| GB1030266A (en) * | 1964-07-06 | 1966-05-18 | Peterson Electronic Die Co Inc | Casings for books |
| FR1524510A (en) * | 1966-05-11 | 1968-05-10 | Sumitomo Chemical Co | Manufacturing process of decorated and injection-molded articles in thermoplastic resins |
| DE1986454U (en) * | 1967-11-15 | 1968-05-30 | Kalle Ag | CONTAINERS WITH BOTTOM AND SIDE PANELS MADE OF DEEP DRAWABLE COMPOSITE MATERIAL. |
-
1973
- 1973-06-02 DE DE19737320711U patent/DE7320711U/en not_active Expired
-
1974
- 1974-01-25 ES ES1974199845U patent/ES199845Y/en not_active Expired
- 1974-04-05 AT AT287074A patent/AT338740B/en not_active IP Right Cessation
- 1974-04-24 NL NL7405499A patent/NL7405499A/xx unknown
- 1974-05-07 FR FR7415774A patent/FR2232027B1/fr not_active Expired
- 1974-05-10 BE BE144147A patent/BE814826A/en not_active IP Right Cessation
- 1974-05-23 GB GB2319674A patent/GB1470835A/en not_active Expired
- 1974-05-24 CA CA200,807A patent/CA1057185A/en not_active Expired
- 1974-05-28 DK DK287174A patent/DK287174A/da unknown
- 1974-05-31 SE SE7407231A patent/SE417807B/en not_active IP Right Cessation
- 1974-05-31 NO NO741989A patent/NO143418C/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2232027A1 (en) | 1974-12-27 |
| ATA287074A (en) | 1977-01-15 |
| NO143418B (en) | 1980-11-03 |
| ES199845U (en) | 1975-08-01 |
| NO741989L (en) | 1974-12-03 |
| GB1470835A (en) | 1977-04-21 |
| SE7407231L (en) | 1974-12-03 |
| NL7405499A (en) | 1974-12-04 |
| DK287174A (en) | 1975-01-20 |
| FR2232027B1 (en) | 1977-06-24 |
| SE417807B (en) | 1981-04-13 |
| AT338740B (en) | 1977-09-12 |
| NO143418C (en) | 1981-02-18 |
| ES199845Y (en) | 1975-12-16 |
| BE814826A (en) | 1974-09-02 |
| DE7320711U (en) | 1973-11-22 |
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