IE52644B1 - Container and lid therefor - Google Patents

Container and lid therefor

Info

Publication number
IE52644B1
IE52644B1 IE2709/81A IE270981A IE52644B1 IE 52644 B1 IE52644 B1 IE 52644B1 IE 2709/81 A IE2709/81 A IE 2709/81A IE 270981 A IE270981 A IE 270981A IE 52644 B1 IE52644 B1 IE 52644B1
Authority
IE
Ireland
Prior art keywords
flange
container
lid
releasing
snap
Prior art date
Application number
IE2709/81A
Other versions
IE812709L (en
Original Assignee
Reed Packaging Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8138096&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=IE52644(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Reed Packaging Ltd filed Critical Reed Packaging Ltd
Publication of IE812709L publication Critical patent/IE812709L/en
Publication of IE52644B1 publication Critical patent/IE52644B1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D45/00—Clamping or other pressure-applying devices for securing or retaining closure members
    • B65D45/02—Clamping or other pressure-applying devices for securing or retaining closure members for applying axial pressure to engage closure with sealing surface
    • B65D45/16—Clips, hooks, or clamps which are removable, or which remain connected either with the closure or with the container when the container is open, e.g. C-shaped
    • B65D45/20—Clips, hooks, or clamps which are removable, or which remain connected either with the closure or with the container when the container is open, e.g. C-shaped pivoted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D43/00—Lids or covers for rigid or semi-rigid containers
    • B65D43/02—Removable lids or covers
    • B65D43/0202—Removable lids or covers without integral tamper element
    • B65D43/0214—Removable lids or covers without integral tamper element secured only by friction or gravity
    • B65D43/0218—Removable lids or covers without integral tamper element secured only by friction or gravity on both the inside and the outside of the mouth of the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00018—Overall construction of the lid
    • B65D2543/00064—Shape of the outer periphery
    • B65D2543/00074—Shape of the outer periphery curved
    • B65D2543/00092—Shape of the outer periphery curved circular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00018—Overall construction of the lid
    • B65D2543/00259—Materials used
    • B65D2543/00296—Plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/0049—Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
    • B65D2543/00509—Cup
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/0049—Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
    • B65D2543/00527—NO contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/00537—Contact between the container and the lid on the inside or the outside of the container on the outside, or a part turned to the outside of the mouth of the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444—Contact between the container and the lid
    • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/00555—Contact between the container and the lid on the inside or the outside of the container on both the inside and the outside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00824—Means for facilitating removing of the closure
    • B65D2543/00833—Integral tabs, tongues, handles or similar
    • B65D2543/00842—Integral tabs, tongues, handles or similar outside of the lid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2543/00—Lids or covers essentially for box-like containers
    • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00953—Sealing means
    • B65D2543/0099—Integral supplemental sealing lips

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Table Devices Or Equipment (AREA)

Abstract

A container lid is provided with a lid flange 2 downwardly merging into a releasing flange 13 which from a position in which an inwardly extending snap rib 9 on said flange 2 engages a sealing edge on a container flange 9 or a container mouth bead is upwardly bendable to a position in which said snap rib 8 goes clear of said container flange or abuts it at slight pressure. Releasing flange 13 acts as a bistable snap catch and is retained in its extreme positions by means of its inherent annular tension. Releasing flange 13 causes even a large container lid seated firmly prestressed on a container to be readily removed, no tools being necessary.

Description

The present invention relates to a container and a lid therefor, said lid being of a resiliently deformable plastics material and having a downwardly extending lid flange provided with an inner annular snap rib engaging a peripheral flange of the container.
Lids of the type used as tight-sealing closures for containers, e.g. paint buckets, are often difficult to remove because effective sealing implies powerful prestressing of the container lid material.
It is an object of the invention to facilitate removal of tight container lids from containers.
The invention provides a container having a mouth and a lid for closing the container mouth and engageable along a sealing portion with the edge of said mouth, said lid being of a resiliently deformable plastics material and having a downwardly extending lid flange provided with an inner annular snap rib engageable with a peripheral flange on the container, said lid flange adjacent to said snap rib merging into an annular releasing flange which constitutes a bistable snap catch and is bendable from a downwardly extending position in which in tensioned condition the snap rib abuts the peripheral container flange to an upwardly extending portion in which the snap rib is clear of the peripheral container flange or abuts the latter at a reduced tension, characterized in that a) said lid flange is located outside the container mouth at a radial distance therefrom and merges with a sharp bend into a conical rim portion . of the lid, b) the vertical distance between the edge of the container mouth and the lower edge of the peripheral container flange is greater than the 82644 - 3 vertical distance between the sealing portion of the lid and the upper surface of the snap rib, when the releasing flange is in its downwardly extending position with the lid removed from the container, and c) an annular frusto-conical recess is provided in the inner wall of the lid flange, said recess widening downwards to a thin resilient portion of said lid flange directly above said snap rib.
The lid flange and the releasing flange constitute the links of a bistable toggle joint, the portion between said flanges constituting a hinge connection, and the annular tension of the releasing flange acting as a spring which in the one position of the flange assists in keeping said snap rib and said container flange firmly interengaged, and in the other position keeping the snap rib clear of or only in light contact with said container flange. By moving his fingers along the lower side of the releasing flange, a person handling the container may readily bring the releasing flange past a bent position, in which the annular tension is at maximum, thus enabling the releasing flange to snap up into its releasing position. The lid can now be easily removed, and when the container is in use the lid may be placed loosely thereon for temporary protection of its contents.
In the sealing position, the lower surface of the lid tightly abuts the mouth edge of the container along a sealing portion, usually in the form of a narrow sealing line, the lid flange lying at a radial distance outside the container mouth and merging with a sharp bend merging into a conical rim portion of the lid without any possibility of - 4 transferring a bending momentum. The lid in this position is axially tensioned owing to the fact that the vertical distance between the edge of the container mouth and the lower edge of the container flange is greater than the vertical distance between the sealing portion of the lid and the upper surface of the snap rib on said lid flange of the removed lid. Placing of the lid on the container generates a powerful axial tensile force in the lid flange. By selecting suitable dimensions, the tension can be made higher the higher the required pressure is per unit of area at the sealing portion between the container mouth and the lid. Since the lid flange is only axially tensioned and thus only subjected to tensile force, the joint portion between the lid flange and the releasing flange may be relatively thin-walled, and thus bending the releasing, flange from its one position to the other practically only requires the maximum peripheral tension of the releasing flange to be overcome.
It is of minor importance whether the annular tension is greatest in the sealing position or in the releasing position of the releasing flange, and for this reason the releasing flange may extend substantially vertically downwards along the container wall so as to avoid problems when a number of containers are positioned next to each other.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawing, in which Fig. 1 is a radial sectional view of a lid of the embodiment, Fig. 2 is a plan view of said lid, and Fig. 3 is a sectional view of the lid on its container.
The container lid shown in Figs. 1 to 3 has a plane surface 1 and a substantially axial - and when in use - downwardly extending flange 2 which via a conical rim portion 3 merges into a radial flange portion 4 connected to the plane lid surface 1 through a substantially axial inner flange portion 5. The lower surface of tbe radial flange portion 4 is provided with an axial guide rib 6 and a sharp sealing rib 7 abutting the edge of the container mouth along a narrow sealing line. When the container is tightly sealed a snap rib 8 on the inner side of the lid flange 2 abuts a downwardly extending locking edge at the extremity of a container flange 9 extending from the container wall 10. Fig. 3 shows - in dotted lines - the position of the conical rim portion 3 when the lid is loosely seated on the container. In this position the vertical distance from the container mouth edge to the downwardly extending locking edge of the container flange 9 is greater than the vertical distance from the sealing rib 7 to the top of the snap rib 8. When the lid is tightly seated on the container the conical rim portion 3 is pressed down - shown in full lines - by means of axial pressure, the snap rib 8 thus engaging the locking edge of the container flange 9. The lid flange 2 is thus subjected to axial tensile force causing the sealing rib 7 to be powerfully pressed against the container mouth.
Immediately above the snap rib 8 lid flange 2 is provided with an annular recess 11 and merges via a thin-walled portion 12 into a releasing flange 13 which in its sealing position extends downwardly as shown.
When a container user wishes to remove the lid, - 6 he moves his fingers along the lower surface of the sealing flange 13, exerting an outwardly ascending pressure thus increasing the annular tension to maximum so that the flange suddenly snaps upwards into its upper position shown in dotted lines, in which the snap rib 8 is clear of the container flange 9. The releasing flange 13 thus acts as a bistable toggle joint along the thin-walled portion 12 hingedly connected to lid flange 2 and retained in its extreme positions by means of the annular tension of the flange. If the releasing flange 13 is so shaped that in sealing position it extends further out from the container wall in radial direction, the increased annular tension will cause a still firmer interengagement of the snap rib 8 and the container flange 9.
It is not absolutely necessary to let the sealing rib of the embodiment shown in Fig. 3 go completely clear of the container flange 9 during removal of or replacing the lid on the container.
The container lid with its bistable snap catch releasing flange may be differently shaped from the embodiment shown in the drawing. In particular the periphery of the lid may be regularly polygonal with rounded corners, so as to be suited for corresponding polygonal containers, such as containers for the storage of food, lunch boxes, and food buckets.

Claims (3)

1. A container having a mouth and a lid for closing the container mouth and engageable along a sealing portion with the edge of said mouth, said lid being of a resiliently deformable plastics material and having a downwardly extending lid flange provided with an inner annular snap rib engageable with a peripheral flange on the container, said lid flange adjacent to said snap rib merging into an annular releasing flange which constitutes a bistable snap catch and is bendable from a downwardly extending position in which in tensioned condition the snap rib abuts the peripheral container flange to an upwardly extending position in which the snap rib is clear of the peripheral container flange or abuts the latter at a reduced tension, characterized in that a) said lid flange is located outside the container mouth at a radial distance therefrom and merges with a sharp bend into a conical rim portion of the lid, b) the vertical distance between the edge of the container mouth and the lower edge of the peripheral container flange is greater than the vertical distance between the sealing portion of the lid and the upper surface of the snap rib, when the releasing flange is in its downwardly extending position with the lid removed from the container, and c) an annular frusto-conical recess is provided in the inner wall of the lid flange, said recess widening downwards to a thin resilient portion of said lid flange directly above said snap rib.
2. A container lid according to claim 1 wherein the releasing flange is shaped so as to extend substantially axially when in its downwardly extending position.
3. A container and a lid therefor according to claim 1, constructed and arranged substantially as hereinbefore described with reference to and as illus5 trated in Figures 1 to 3 of the accompanying drawings.
IE2709/81A 1980-11-20 1981-11-19 Container and lid therefor IE52644B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK494880A DK145194C (en) 1980-11-20 1980-11-20 CONTAINER COVER OF ELASTIC DEFORMABLE PLASTIC

Publications (2)

Publication Number Publication Date
IE812709L IE812709L (en) 1982-05-20
IE52644B1 true IE52644B1 (en) 1988-01-06

Family

ID=8138096

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2709/81A IE52644B1 (en) 1980-11-20 1981-11-19 Container and lid therefor

Country Status (19)

Country Link
JP (1) JPS5940704B2 (en)
AU (1) AU541009B2 (en)
BE (1) BE891184A (en)
CA (1) CA1166192A (en)
CH (1) CH654807A5 (en)
DE (1) DE3140234C2 (en)
DK (1) DK145194C (en)
ES (1) ES269738Y (en)
FI (1) FI72937C (en)
FR (1) FR2495111B1 (en)
GB (1) GB2091706B (en)
IE (1) IE52644B1 (en)
IT (1) IT1142979B (en)
LU (1) LU83681A1 (en)
NL (1) NL191258B (en)
NO (1) NO153252C (en)
PT (1) PT73853B (en)
SE (1) SE450948C (en)
ZA (1) ZA817038B (en)

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USRE32927E (en) 1983-10-31 1989-05-23 Reynolds Metals Company Resealable container closure
US4574975A (en) * 1984-09-20 1986-03-11 Reynolds Metals Company Resealable container closure
EP0245894B1 (en) * 1986-05-13 1990-03-07 Eurotool B.V. Container having a detachably fastened lid
US4721210A (en) * 1986-11-18 1988-01-26 Lawrence Richard R Tamper-evident package
JPH01501787A (en) * 1986-11-21 1989-06-22 ラガン　プラスト　アー　ベー Snap-locking device for covered containers
US4793510A (en) * 1987-07-13 1988-12-27 Reynolds Metals Company Resealable container closure
DE3802287A1 (en) * 1988-01-27 1989-04-13 Westform Plastikwerke Gmbh PLASTIC CONTAINER LID WITH OPENING DEVICE
DK160701C (en) * 1989-02-10 1991-09-23 Panther Plast As container lid
DE8909454U1 (en) * 1989-08-05 1989-11-02 Kunststoffwerk Eugen Saier Gmbh & Co, 7297 Alpirsbach Pot-shaped vessel, especially bucket, with lid
GB9219379D0 (en) * 1992-09-12 1992-10-28 Ferster Chaim A container and lid
DE29711743U1 (en) * 1997-07-04 1997-09-04 Kunststoffwerke Adolf Hopf GmbH & Co, 86720 Nördlingen Transport and use container for highly viscous consumables
FR2783241B1 (en) * 1998-09-15 2000-12-22 Allibert Sa LID WITH LOCKING HANDLE FOR CLOSING A STORAGE CONTAINER
DE10022851A1 (en) * 2000-05-10 2001-11-22 Streuber Sulo Eisenwerk F Tub with lid; has barrel-like body and fitted, sealing lid with seal that can be opened and resealed and tightening device to tighten lid against body, so that lid engages body tightly and completely
AU2006200114B2 (en) * 2005-03-31 2009-05-21 Innovative Design Co Pty Ltd Container closure
DE10337263B3 (en) * 2003-08-13 2005-01-20 Aco Severin Ahlmann Gmbh & Co. Kg Covering grid for drainage gutter has circular locking spring which can adopt one of two stable positions and has edge engaging with grooves in sides of top portion of gutter
GB0407368D0 (en) * 2004-03-31 2004-05-05 Ici Plc Container and closure arrangement
EP1792835A1 (en) 2005-12-02 2007-06-06 Superfos A/S Asymmetric container with pivotable handle
AU2006225177B2 (en) * 2006-01-12 2009-05-21 Innovative Design Co Pty Ltd Container closure
CN101356098B (en) * 2006-09-19 2010-12-01 创新设计有限公司 Resealable flexible container lid with pivoting portions
ES2348053T3 (en) 2006-11-20 2010-11-29 Superfos A/S METHOD FOR PRODUCING A RANGE OF PLASTIC PACKAGED PRODUCTS MOLDED BY INJECTION THAT INCLUDE A CUBE AND A COVER.
GB201503181D0 (en) * 2015-02-25 2015-04-08 Cellpath Ltd Histology cassette stack

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Also Published As

Publication number Publication date
CA1166192A (en) 1984-04-24
NL8105173A (en) 1982-06-16
AU7627481A (en) 1982-05-27
DE3140234A1 (en) 1982-08-26
SE450948B (en) 1987-08-17
PT73853B (en) 1983-01-25
NL191258B (en) 1994-11-16
FI812908L (en) 1982-05-21
IT8149584A0 (en) 1981-10-28
IE812709L (en) 1982-05-20
ZA817038B (en) 1982-09-29
BE891184A (en) 1982-05-19
ES269738Y (en) 1984-01-16
FR2495111A1 (en) 1982-06-04
IT1142979B (en) 1986-10-15
NO153252B (en) 1985-11-04
FR2495111B1 (en) 1985-10-31
ES269738U (en) 1983-07-01
DK145194C (en) 1983-02-28
DE3140234C2 (en) 1986-08-28
LU83681A1 (en) 1982-02-18
FI72937C (en) 1987-08-10
JPS5940704B2 (en) 1984-10-02
GB2091706A (en) 1982-08-04
SE8106169L (en) 1982-05-21
DK494880A (en) 1982-05-21
CH654807A5 (en) 1986-03-14
GB2091706B (en) 1984-11-07
FI72937B (en) 1987-04-30
DK145194B (en) 1982-10-04
NO153252C (en) 1986-02-12
NO813924L (en) 1982-05-21
AU541009B2 (en) 1984-12-13
SE450948C (en) 1996-04-22
PT73853A (en) 1981-11-01
JPS57133852A (en) 1982-08-18

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