NO153272C - Fremgangsmaate til fremstilling av et roer av termoplastmateriale, saasom polyvinylklorid - Google Patents

Fremgangsmaate til fremstilling av et roer av termoplastmateriale, saasom polyvinylklorid

Info

Publication number
NO153272C
NO153272C NO781175A NO781175A NO153272C NO 153272 C NO153272 C NO 153272C NO 781175 A NO781175 A NO 781175A NO 781175 A NO781175 A NO 781175A NO 153272 C NO153272 C NO 153272C
Authority
NO
Norway
Prior art keywords
procedure
preparation
tube
polyvinyl chloride
thermoplastic material
Prior art date
Application number
NO781175A
Other languages
English (en)
Norwegian (no)
Other versions
NO781175L (no
NO153272B (no
Inventor
Jan Peter Van Dongeren
Original Assignee
Wavin Bv
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 Wavin Bv filed Critical Wavin Bv
Publication of NO781175L publication Critical patent/NO781175L/no
Publication of NO153272B publication Critical patent/NO153272B/no
Publication of NO153272C publication Critical patent/NO153272C/no

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
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-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
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the 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
    • 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
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • 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
    • B29L2024/00—Articles with hollow walls
    • B29L2024/006—Articles with hollow walls multi-channelled
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Materials For Medical Uses (AREA)
  • Tubes (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Tyre Moulding (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
NO781175A 1977-04-06 1978-04-04 Fremgangsmaate til fremstilling av et roer av termoplastmateriale, saasom polyvinylklorid NO153272C (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7703820,A NL176804C (nl) 1977-04-06 1977-04-06 Kunststofbuis met langskanalen in zijn wand, alsmede werkwijze voor het vervaardigen van een dergelijke kunststofbuis.

Publications (3)

Publication Number Publication Date
NO781175L NO781175L (no) 1978-10-09
NO153272B NO153272B (no) 1985-11-04
NO153272C true NO153272C (no) 1986-02-12

Family

ID=19828317

Family Applications (2)

Application Number Title Priority Date Filing Date
NO781175A NO153272C (no) 1977-04-06 1978-04-04 Fremgangsmaate til fremstilling av et roer av termoplastmateriale, saasom polyvinylklorid
NO852127A NO852127L (no) 1977-04-06 1985-05-29 Ekstrudert roer av termoplastmateriale med langsgaaende kanaler i roerveggen

Family Applications After (1)

Application Number Title Priority Date Filing Date
NO852127A NO852127L (no) 1977-04-06 1985-05-29 Ekstrudert roer av termoplastmateriale med langsgaaende kanaler i roerveggen

Country Status (21)

Country Link
US (2) US4305899A (ja)
JP (1) JPS5415524A (ja)
AT (1) AT364206B (ja)
BE (1) BE865742A (ja)
BR (1) BR7802169A (ja)
CH (1) CH624458A5 (ja)
DE (2) DE2814595C2 (ja)
DK (1) DK151858C (ja)
ES (1) ES469372A1 (ja)
FI (1) FI67193C (ja)
FR (1) FR2386761A1 (ja)
GB (1) GB1599845A (ja)
IE (1) IE46521B1 (ja)
IN (1) IN153728B (ja)
IT (1) IT1102562B (ja)
MX (1) MX147106A (ja)
NL (1) NL176804C (ja)
NO (2) NO153272C (ja)
SE (2) SE430316B (ja)
SU (1) SU1052171A3 (ja)
YU (2) YU80978A (ja)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL175753C (nl) * 1977-11-18 1984-12-17 Wavin Bv Bronbuis.
DE3317661C2 (de) * 1983-05-14 1986-06-26 Stettner & Co, 8560 Lauf Kaminrohr
FR2596692B1 (fr) * 1986-04-04 1988-09-09 Atochem Tubes en matiere plastique semi-cristalline extrudes presentant une resistance au choc a froid et a la traction amelioree par un traitement thermique et leur procede de fabrication
US5252157A (en) * 1989-05-01 1993-10-12 Central Plastics Company Electrothermal fusion of large diameter pipes by electric heating wire wrapping and sleeve connector
US5514069A (en) * 1993-12-22 1996-05-07 Baxter International Inc. Stress-bearing umbilicus for a compact centrifuge
US5661263A (en) * 1995-05-10 1997-08-26 Phaeton, Llc Surface raceway and method
US5989177A (en) * 1997-04-11 1999-11-23 Baxter International Inc. Umbilicus gimbal with bearing retainer
US6344020B1 (en) 1997-04-11 2002-02-05 Baxter International Inc. Bearing and umbilicus gimbal with bearing retainer in blood processing system
US6702520B2 (en) 2000-05-10 2004-03-09 C.I. Technologies Multi-purpose rehabilitation of conduits
US6311730B2 (en) 2000-10-05 2001-11-06 G. Gregory Penza Communications conduit installation method and conduit-containing product suitable for use therein
US6748982B2 (en) 2001-11-13 2004-06-15 Tokheim Holding B.V. Integrated fuel delivery and vapor recovery system for a fuel dispenser
US7479123B2 (en) 2002-03-04 2009-01-20 Therakos, Inc. Method for collecting a desired blood component and performing a photopheresis treatment
US7211037B2 (en) * 2002-03-04 2007-05-01 Therakos, Inc. Apparatus for the continuous separation of biological fluids into components and method of using same
JP4171280B2 (ja) * 2002-03-06 2008-10-22 積水化学工業株式会社 硬質塩化ビニル系樹脂管
NL1021124C2 (nl) * 2002-03-28 2003-09-30 Nefit Buderus B V Warmtewisselaar, verbrandingsinrichting omvattende een warmtewisselaar, afsluitelement voor gebruik in een dergelijke warmtewisselaar en werkwijze voor het vervaardigen van een warmtewisselaar.
US20050049539A1 (en) * 2003-09-03 2005-03-03 O'hara Gerald P. Control system for driving fluids through an extracorporeal blood circuit
GB2408961A (en) * 2003-12-12 2005-06-15 Univ Cambridge Tech Apparatus and method
US7476209B2 (en) * 2004-12-21 2009-01-13 Therakos, Inc. Method and apparatus for collecting a blood component and performing a photopheresis treatment
GB0620246D0 (en) * 2006-10-12 2006-11-22 Univ Cambridge Tech Extruded materials having capillary channels
US8257239B2 (en) 2010-06-15 2012-09-04 Fenwal, Inc. Umbilicus for use in an umbilicus-driven fluid processing
US8277369B2 (en) 2010-06-15 2012-10-02 Fenwal, Inc. Bearing and bearing assembly for umbilicus of a fluid processing system
US9383044B2 (en) 2013-02-15 2016-07-05 Fenwal, Inc. Low cost umbilicus without overmolding
US10596943B2 (en) * 2016-08-24 2020-03-24 Amatrimara Inc. Stanchion padding
CN114434773A (zh) * 2022-01-06 2022-05-06 内蒙古师范大学 一种大口径有机玻璃棒的制备系统

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US2373093A (en) * 1943-04-22 1945-04-10 Bell Telephone Labor Inc Process for inhibiting cracking of polymeric bodies
US2990580A (en) * 1956-06-04 1961-07-04 Du Pont Process for improving bursting strength of polyethylene pipe
BE597653A (ja) * 1960-03-08 1900-01-01
US3110754A (en) * 1960-05-11 1963-11-12 William W Witort Conduit system and components therefor
CH395523A (de) * 1962-10-18 1965-07-15 Rollmaplast Ag Verfahren zum Abbauen von Herstellungsspannungen in aussenkalibrierten Kunststoffrohren
US3274315A (en) * 1963-02-25 1966-09-20 Tokan Kogyo Co Ltd Process for unitized construction of synthetic resin board or cylinder
NL298140A (ja) * 1963-09-19 1900-01-01
DE1277550B (de) * 1965-04-15 1968-09-12 Schneider & Co Vorrichtung zum Herstellen von Koerpern aus Kunststoff mit zueinander parallelen, in Richtung des aus der Vorrichtung austretenden Materials verlaufenden durchgehenden Kanaelen
US3372920A (en) * 1965-07-12 1968-03-12 Nat Distillers Chem Corp Method for producing thermoplastic sheet material
NL6510582A (ja) * 1965-08-13 1967-02-14
US3507939A (en) * 1966-12-12 1970-04-21 Phillips Petroleum Co Plastic extrusion
BE722009A (ja) * 1967-10-13 1969-03-14
DE1775674A1 (de) * 1968-09-09 1970-12-17 Franz Baumgartner Kunststoffrohre aus Thermoplastkunststoffen mit Hohlkoerperrohrwand fuer grosse Nennweiten fuer Druckrohre und drucklose Rohre mit und ohne Bewehrungseinlagen
US3668288A (en) * 1968-11-18 1972-06-06 Keiichi Takahashi Method for making thermoplastic synthetic resin hollow structure articles
DE1914255A1 (de) * 1969-03-20 1970-10-01 Buerkle Kg Kehlleistenfabrik Vorrichtung zur Verhinderung des Austritts des Stuetzmediums bei der kontinuierlichen Herstellung von Hohlprofilen aus Kunststoff
JPS4889971A (ja) * 1972-02-29 1973-11-24
DE2324133A1 (de) * 1973-05-12 1974-11-28 Hoechst Ag Aussenkalibrieren von extrudierten hohlprofilen aus thermoplastischem kunststoff
US3907961A (en) * 1974-01-28 1975-09-23 Phillips Petroleum Co Flexible cylinder for cooling an extruded pipe
US3941157A (en) * 1974-07-24 1976-03-02 Barnett Louis H High strength multiple passageway plastic conduit
JPS5117261A (en) * 1974-08-01 1976-02-12 Kubota Ltd Enkabinirupaipuno naimensenjooshidashiseikeihoho
JPS5117260A (en) * 1974-08-01 1976-02-12 Kubota Ltd Enkabinirupaipuno naimenmudokukaoshidashiseikeihoho
JPS523215B2 (ja) * 1974-09-27 1977-01-26
JPS5144772U (ja) * 1974-09-28 1976-04-02
NL7500386A (nl) * 1975-01-13 1976-07-15 Wavin Bv Werkwijze en inrichting voor het vervaardigen van een kunststofbuis met langwerpige kanalen in de wand.
JPS51111872A (en) * 1975-03-28 1976-10-02 Kubota Ltd Method of extruding long plastic tubu to produce tubu with connecting socket protion
JPS51137462U (ja) * 1975-04-30 1976-11-06

Also Published As

Publication number Publication date
YU132283A (en) 1986-06-30
CH624458A5 (ja) 1981-07-31
SE8303187D0 (sv) 1983-06-06
DE2814595A1 (de) 1978-10-19
FR2386761A1 (fr) 1978-11-03
JPS5640012B2 (ja) 1981-09-17
SU1052171A3 (ru) 1983-10-30
NO781175L (no) 1978-10-09
US4305899A (en) 1981-12-15
FI67193C (fi) 1985-02-11
DK151858C (da) 1988-09-05
SE8303187L (sv) 1983-06-06
AT364206B (de) 1981-10-12
DE2814595C2 (de) 1985-09-12
BR7802169A (pt) 1978-11-21
NL176804B (nl) 1985-01-02
SE7803862L (sv) 1978-10-07
US4440195A (en) 1984-04-03
NO153272B (no) 1985-11-04
SE430316B (sv) 1983-11-07
NL176804C (nl) 1985-06-03
SE457904B (sv) 1989-02-06
FI67193B (fi) 1984-10-31
DK151858B (da) 1988-01-11
IE780670L (en) 1978-10-06
JPS5415524A (en) 1979-02-05
FR2386761B1 (ja) 1982-11-05
ES469372A1 (es) 1979-02-01
YU80978A (en) 1984-04-30
IN153728B (ja) 1984-08-11
MX147106A (es) 1982-10-06
DK153778A (da) 1978-10-07
IE46521B1 (en) 1983-07-13
IT1102562B (it) 1985-10-07
NL7703820A (nl) 1978-10-10
IT7848751A0 (it) 1978-04-05
GB1599845A (en) 1981-10-07
ATA244978A (de) 1981-02-15
NO852127L (no) 1978-10-09
DE2858267A1 (ja) 1985-05-09
BE865742A (fr) 1978-10-06
FI781032A (fi) 1978-10-07

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