DE1536085A1 - Verpackungsbehaelter aus Kunststoffolien und Vorrichtung zu seiner Herstellung - Google Patents

Verpackungsbehaelter aus Kunststoffolien und Vorrichtung zu seiner Herstellung

Info

Publication number
DE1536085A1
DE1536085A1 DE19661536085 DE1536085A DE1536085A1 DE 1536085 A1 DE1536085 A1 DE 1536085A1 DE 19661536085 DE19661536085 DE 19661536085 DE 1536085 A DE1536085 A DE 1536085A DE 1536085 A1 DE1536085 A1 DE 1536085A1
Authority
DE
Germany
Prior art keywords
packaging container
manufacture
container made
plastic film
container according
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.)
Pending
Application number
DE19661536085
Other languages
English (en)
Inventor
Domke Dipl-Ing Klaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FR Hesser Maschinenfabrik AG
Original Assignee
FR Hesser Maschinenfabrik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FR Hesser Maschinenfabrik AG filed Critical FR Hesser Maschinenfabrik AG
Publication of DE1536085A1 publication Critical patent/DE1536085A1/de
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2424—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/2878—Securing closures on containers by heat-sealing
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
    • B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
    • B65D75/32—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
    • B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
    • B65D75/32—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents
    • B65D75/325—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents one sheet being recessed, and the other being a flat not- rigid sheet, e.g. puncturable or peelable foil
    • B65D75/326—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents one sheet being recessed, and the other being a flat not- rigid sheet, e.g. puncturable or peelable foil and forming one compartment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Closing Of Containers (AREA)

Description

  • "Verpackungsbehälter aus Kunststoffolien und Vorrichtung zu seiner Herstellung" Die Erfindung betrifft einen Verpackungsbehälter aus durchsichtigen Kunststoffolien, der aus einem durch Tiefziehen hergestellten Unterteil besteht, auf den ein Deckel aufge schweisst oder aufgeklebt ist.
  • Derartige Behälter eignen sich vorzugsweise zum Verpacken von Nahrungs- und Genu#mitteln, da sie infolge ihrer allseitigen Dürchsichtigkeit den Inhalt sehr-gut erkennen lassen.
  • Als nachteilig wird jedoch oft empfunden, dass derartige Pakkungen infolge ihrer flanschartigen, über den Querschnitt der Packung überstehenden Deckelnaht nicht hochkant gestellt bzw. nicht als hochkant zu stellende Packung hergestellt werden können. Ausserdem bietet das Hei#siegeln dieser flanschartigen Nähte bei PVC-Folien, die infolge ihrer grossen Klarheit für die genannten Zwecke an sich sehr geeignet wären, ziemliche Schwierigkeiten, so dass man oft auf eine mit grösserem Aufwand verbundene Klebeverbindung ausweichen muss, Es ist der Zweck dieser Erfindung, diese Nachteile der beseitigen und einen Verpackungsbehälter zu schaffen, der ähnlich einer Faltschachtel hochkant zu stellen ist und dessen Deckelnaht auch bei ;Verwendung von PVC-Folien in einfacher Weise schweißbar ist.
  • Zu diesem Zweck wird erfindungsgemäß vorgeschlagen, den tiefgezogenen Unterteil durch eine unmittelbar entlang der Seitenwände des Unterteils verlaufende Trennschweißnaht mit dem Deckel zu verbinden.
  • Durch diese Art der Verbindung von Deckel und Unterteil entsteht eine praktisch randfreie Packung3 die auch auf ihren Schmalseiten einwandfrei standfest isto Darüber hinaus hat sich überraschenderweise gezeigt, dass durch diese Trennschweißung -auch bei PVC-Folien eine ausreichend feste Verbindung zwischen Unterteil und Deckel erzielt werden kann, die auch den üblicherweise auftretenden Fallbeanspruchungen gewachsen ist.
  • Der Gegenstand der Erfindung ist in einem Ausführungsbeispiel in der Ze1chnung- dargesteLlt.
  • Es zeigen Fig. 1 ein Schrägbild des Behälters, Fig. 2 ein zur Herstellung der Deckelnaht dienendes Werkzeug in schematischer Darstellung.
  • Der in Figur 1 dargestellte Verpackungsbehälter ist aus einer PVC-Folie hergestellt und besteht aus einem Unterteil 1 und einem Deckel 2, der durch eine Trennschweißnaht 3 mit dem Unterteil verbunden ist. Die Trennschwei#naht 3 verläuft unmittelbar entlang der Seitenwände des Unterteils, so daß bei der fertigen Packung nur ein belanglos kleiner Schweißwulst besteht.
  • Bei der Herstellung des Behälters wird der Unterteil 1 zweckmässigerweise im Negativ-Verfahren gezogen, so daß im Bereich des zunächst noch flanschartigen Randes 4 der stärkste Materialquerschnitt verbleibt.
  • Das Schweißwerkzeug zum Herstellen der Deckelnaht besteht aus einem im Querschnitt keilartigen, unbeheizten Unterteil 6, dessen obere sich gegen die Aussenwand des Unterteilsianlegende Kante 5 abgerundet ist und einen beheizten Oberteil 7 mit ebener Anpreßfläche. Ober- und Unterteil sind zweckmässigerweise je inform eines einteiligen, den Behälter umschliessenden Rahmens ausgebildet, kannen aber auch, falls eine häufige Formatverstellung durchgeführt werden muss, aus mehreren Teilstücken zusammengesetzt werden.

Claims (4)

  1. Patentansprüche: 1. Verpackungsbehälter aus Kunststoff-Folien, bestehend aus einem tiefgezogenen Unterteil und einem mit diesem verschweissten Deckel, dadurch gekennzeichnet, daß der Deckel (2) durch eine unmittelbar an den Seitenwänden des Unterteils (1) verlaufende Trennschwei#naht (3) mit letzterem verbunden ist.
  2. 2. Verpackungsbehälter nach Anspruch 1, dadurch gekennzeichnet, daß dieser aus PVC-Folie besteht.
  3. 3. Verpackungsbehälter nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der Unterteil (l) in an sich bekannter Weise im Negativverfah5ren tiefgezogen ist, derart, daß im Bereich des oberen Randes (4) das Material seinen grössten Querschnitt aufweist.
  4. 4. Vorrichtung zum Schweißen des Behälters nach den Ansprüchen 1 bis 3, gekennzeichnet durch einen im Querschnitt keil förmigen, nicht beheizten, sich wenigstens mit seiner abgerundeten Oberkante gegen die Seitenwand des Unterteils (1) legenden und diesen allseits umfassenden Unterteil (6) und einen gegen den Unterteil führbaren, mit ebener Pre#fläche versehenen beheizten Oberteil (7).
DE19661536085 1966-10-05 1966-10-05 Verpackungsbehaelter aus Kunststoffolien und Vorrichtung zu seiner Herstellung Pending DE1536085A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0060663 1966-10-05

Publications (1)

Publication Number Publication Date
DE1536085A1 true DE1536085A1 (de) 1969-12-11

Family

ID=7161070

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19661536085 Pending DE1536085A1 (de) 1966-10-05 1966-10-05 Verpackungsbehaelter aus Kunststoffolien und Vorrichtung zu seiner Herstellung

Country Status (2)

Country Link
CH (1) CH470291A (de)
DE (1) DE1536085A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218023A1 (de) * 1985-08-10 1987-04-15 Jacob Berg GmbH & Co. KG Geschweisster Kunststoffverschluss für Kunststoffbehälter, Verfahren zur Herstellung desselben und Vorrichtung zur Durchführung des Verfahrens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218023A1 (de) * 1985-08-10 1987-04-15 Jacob Berg GmbH & Co. KG Geschweisster Kunststoffverschluss für Kunststoffbehälter, Verfahren zur Herstellung desselben und Vorrichtung zur Durchführung des Verfahrens
US4746025A (en) * 1985-08-10 1988-05-24 Jacob Berg Gmbh & Co. Kg Plastic container closure and method of making it

Also Published As

Publication number Publication date
CH470291A (de) 1969-03-31

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