IT1008971B - Procedimento di fabbricazione di un tubo in politetrafluoroetilene pre sentante una molto bassa permeabili ta e tubo ottenuto con detto procedimento - Google Patents

Procedimento di fabbricazione di un tubo in politetrafluoroetilene pre sentante una molto bassa permeabili ta e tubo ottenuto con detto procedimento

Info

Publication number
IT1008971B
IT1008971B IT48837/74A IT4883774A IT1008971B IT 1008971 B IT1008971 B IT 1008971B IT 48837/74 A IT48837/74 A IT 48837/74A IT 4883774 A IT4883774 A IT 4883774A IT 1008971 B IT1008971 B IT 1008971B
Authority
IT
Italy
Prior art keywords
procedure
pipe
polytetral
fluoroethylene
low permeability
Prior art date
Application number
IT48837/74A
Other languages
English (en)
Italian (it)
Original Assignee
Steiger Engineering 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 Steiger Engineering Ag filed Critical Steiger Engineering Ag
Application granted granted Critical
Publication of IT1008971B publication Critical patent/IT1008971B/it

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/581—Winding and joining, e.g. winding spirally helically using sheets or strips consisting principally of plastics material
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/583—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/583—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features
    • B29C53/585—Winding and joining, e.g. winding spirally helically for making tubular articles with particular features the cross-section varying along their axis, e.g. tapered, with ribs, or threads, with socket-ends
    • 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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • 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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/005—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels the end of an internal lining
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/04—Particle-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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
IT48837/74A 1973-02-27 1974-03-01 Procedimento di fabbricazione di un tubo in politetrafluoroetilene pre sentante una molto bassa permeabili ta e tubo ottenuto con detto procedimento IT1008971B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH282973A CH562098A5 (un) 1973-02-27 1973-02-27

Publications (1)

Publication Number Publication Date
IT1008971B true IT1008971B (it) 1976-11-30

Family

ID=4242528

Family Applications (1)

Application Number Title Priority Date Filing Date
IT48837/74A IT1008971B (it) 1973-02-27 1974-03-01 Procedimento di fabbricazione di un tubo in politetrafluoroetilene pre sentante una molto bassa permeabili ta e tubo ottenuto con detto procedimento

Country Status (9)

Country Link
JP (1) JPS5925647B2 (un)
BE (1) BE811436A (un)
CH (1) CH562098A5 (un)
DE (1) DE2409178C2 (un)
ES (1) ES423632A1 (un)
FR (1) FR2218987B1 (un)
GB (1) GB1466183A (un)
IT (1) IT1008971B (un)
NL (1) NL183230C (un)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478665A (en) * 1980-11-06 1984-10-23 W. L. Gore & Associates, Inc. Method for manufacturing highly porous, high strength PTFE articles
GB2096526A (en) * 1981-02-27 1982-10-20 Junkosha Co Ltd Method of manufacturing porous tetrafluoroethylene tubes
DE3214447C2 (de) * 1982-04-20 1994-05-11 Eilentropp Hew Kabel Ungesintertes Wickelband des Polytetrafluorethylen
US4478898A (en) * 1982-06-04 1984-10-23 Junkosha Co., Ltd. Laminated porous polytetrafluoroethylene tube and its process of manufacture
CA1198973A (en) * 1982-08-23 1986-01-07 The Dow Chemical Company Preparation of flanged plastic lined pipe and apparatus therefor
GB8918702D0 (en) * 1989-08-16 1989-09-27 Shell Int Research Process for the preparation of random solution copolymers of conjugated dienes and vinyl aromatic compounds
FR2662632B1 (fr) * 1990-05-30 1992-10-30 Plastic Omnium Cie Procede pour la realisation de tubes minces en resine fluoree notamment en polytetrafluorethylene.
JPH0641167B2 (ja) * 1990-06-23 1994-06-01 ニチアス株式会社 テトラフルオロエチレン樹脂パイプの製造法
DE4103540C2 (de) * 1991-02-06 1995-03-09 Eilentropp Hew Kabel Verfahren und Vorrichtung zur Herstellung eines Wickelbandes aus sinterfähigen Kunststoffen
FR2679484B1 (fr) * 1991-07-26 1995-02-17 Plastic Omnium Cie Procede pour la realisation de tubes en resine fluoree, notamment en polytetrafluorethylene.
FR2711090B1 (fr) * 1993-10-15 1996-01-05 Plastic Omnium Cie Procédé de fabrication de tubes en résine fluorée incorporant des fibres.
DE4341859A1 (de) * 1993-12-08 1995-06-29 Plastic Omnium Gmbh Verfahren und Vorrichtung zur Herstellung diffusionsdichter mehrschichtiger Kunststoffrohre
DE19546511A1 (de) 1995-12-13 1997-06-19 Eilentropp Kg Polymergemisch und seine Verwendung für hochtemperaturbeständige Verbindungs- und Dichtungselemente
DE19547031A1 (de) 1995-12-15 1997-06-19 Eilentropp Kg Langgestreckte rohrförmige Hülle
IT1284066B1 (it) * 1996-06-25 1998-05-08 Camillo Scotto Procedimento e impianto per la produzione di tubi in resine termoplastiche di riciclo
EP0990506A1 (en) * 1998-09-29 2000-04-05 O'Connell, Michael Production of lined pipes
DE10152604A1 (de) * 2001-10-25 2003-05-08 Drossbach Gmbh & Co Kg Verfahren und Vorrichtung zum Herstellen einer verstärkten Muffe an einem extrudierten Kunststoffrohr aus thermoplastischem Kunststoff
DE10201833B4 (de) * 2002-01-18 2012-06-21 Hew-Kabel Gmbh Verfahren zur Herstellung eines Wickelbandes aus ungesintertem Polytetrafluorethylen
MXPA06013475A (es) 2004-05-27 2007-04-25 Nomaco Inc Sistema de fabricacion de soldadura y perfiles de espuma.
FR2903756B1 (fr) * 2006-07-13 2008-12-12 Plastic Omnium Cie Attenuateur de bruit pour conduite de fluide hydraulique, article comprenant cet attenuateur, conduite compreant cet article et procede d'assemblage.
DE102011055262A1 (de) * 2011-11-11 2013-05-16 Leoni Kabel Holding Gmbh Verfahren und Vorrichtung zur Herstellung eines Wickelbandes
CN103174884A (zh) * 2013-03-26 2013-06-26 赵炜 抗静电聚四氟乙烯衬里防腐管道及其制造方法
CN108291644B (zh) * 2015-09-17 2020-04-17 泰帝特北美公司 螺旋缠绕的ptfe垫片以及制造方法
CN106838482A (zh) * 2017-02-08 2017-06-13 江苏龙麒橡塑有限公司 一种地埋式抗静电阻燃复合石油管道
CN109822930B (zh) * 2018-12-31 2021-03-12 枞阳县中邦科技信息咨询有限公司 一种氟塑料泵衬氟管道的生产工艺
CN111823622A (zh) * 2020-05-18 2020-10-27 泰州市季氟隆塑胶制品有限公司 一种聚四氟乙烯管材及其制备方法
CN112361093B (zh) * 2020-11-17 2022-09-13 重庆四通八达管业有限公司 一种植入式预警增强玄武岩纤维复合管道及制备工艺
CN114230835B (zh) * 2021-11-04 2023-04-14 山东东岳高分子材料有限公司 一种低渗透性聚四氟乙烯管及其制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941911A (en) * 1955-11-15 1960-06-21 Du Pont Method of forming continuous structures of polytetrafluoroethylene
GB967808A (en) * 1961-12-22 1964-08-26 Compoflex Co Ltd Improvements in or relating to flexible tubing
DE1779905B2 (de) * 1962-05-22 1975-09-18 Raybestos-Manhattan, Inc., Manheim, Pa. (V.St.A.) Tetrafluoräthylenpolymerrohr
CH550675A (de) * 1971-04-29 1974-06-28 Polygest Ag Verfahren zur herstellung von ueberzuegen aus polytetrafluoraethylen und nach diesem verfahren hergestellte produkte.

Also Published As

Publication number Publication date
NL183230B (nl) 1988-04-05
NL7402603A (un) 1974-08-29
JPS5925647B2 (ja) 1984-06-20
FR2218987B1 (un) 1976-10-08
FR2218987A1 (un) 1974-09-20
ES423632A1 (es) 1977-01-01
GB1466183A (en) 1977-03-02
DE2409178A1 (de) 1974-08-29
NL183230C (nl) 1988-09-01
CH562098A5 (un) 1975-05-30
DE2409178C2 (de) 1984-08-30
JPS5024368A (un) 1975-03-15
BE811436A (fr) 1974-08-22

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