ES2084037T3 - Estructura de manguera flexible y procedimiento para su fabricacion. - Google Patents

Estructura de manguera flexible y procedimiento para su fabricacion.

Info

Publication number
ES2084037T3
ES2084037T3 ES90914458T ES90914458T ES2084037T3 ES 2084037 T3 ES2084037 T3 ES 2084037T3 ES 90914458 T ES90914458 T ES 90914458T ES 90914458 T ES90914458 T ES 90914458T ES 2084037 T3 ES2084037 T3 ES 2084037T3
Authority
ES
Spain
Prior art keywords
hose
flexible hose
inner hose
reinforcing material
sleeve
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 - Lifetime
Application number
ES90914458T
Other languages
English (en)
Inventor
Jeffrey J Winter
Homer N Holden
James L Lawrence
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.)
Dayco Products LLC
Original Assignee
Dayco Products LLC
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 Dayco Products LLC filed Critical Dayco Products LLC
Application granted granted Critical
Publication of ES2084037T3 publication Critical patent/ES2084037T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe 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
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/18—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/18—Pleated or corrugated hoses
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
    • F16L11/112—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall having reinforcements embedded in the wall
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
    • F16L11/115—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall having reinforcements not embedded in the wall
    • 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
    • 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
    • B29C48/09—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
    • B29C48/12—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
    • B29C48/03—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
    • 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
    • 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
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • 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
    • B29L2009/00—Layered products
    • 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
    • B29L2023/005—Hoses, i.e. flexible
    • 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
    • B29L2023/18—Pleated or corrugated hoses

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

SE DESCRIBEN UNA CONSTRUCCION DE MANGUERA FLEXIBLE Y SU METODO DE FABRICACION, COMPRENDIENDO LA CONSTRUCCION DE MANGUERA FLEXIBLE (20): UNA MANGUERA INTERIOR ONDULADA (21) HECHA DE UN MATERIAL POLIMERICO Y QUE TIENE UNA PLURALIDAD DE PROYECCIONES CONVEXAS HACIA AFUERA (22) CON HENDIDURAS (23) ENTRE ESTAS Y QUE SE EXTIENDEN DE UN EXTREMO (24) A OTRO (25), UNA MANGA EXTERNA (27) DE UN MATERIAL DE REFUERZO DISPUESTO EN UNA RELACION TELESCOPICA SOBRE LA MANGUERA INTERIOR (21), Y UN TUBO (26) DE MATERIAL POLIMERICO DISPUESTO ENTRE LA MANGA (27) DE MATERIAL DE REFUERZO Y LA MANGUERA INTERIOR (21) Y QUE SE EXTIENDE GENERALMENTE EN LINEA RECTA DESDE LA PROYECCION (22) HASTA LA PROYECCION (22) DE LA MANGUERA INTERNA (21) PARA TENDER A EVITAR QUE LA MANGA (27) DEL MATERIAL DE REFUERZO SE INTRODUZCA EN LAS HENDIDURAS (23) DE LA MANGUERA INTERIOR (21) EN UNA CANTIDAD QUE TENDERIA SUSTANCIALMENTE A REDUCIR LAS CARACTERISTICAS DE FLEXIBILIDAD DE LA MANGUERA INTERIOR.
ES90914458T 1989-09-11 1990-08-30 Estructura de manguera flexible y procedimiento para su fabricacion. Expired - Lifetime ES2084037T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/405,487 US5089074A (en) 1989-09-11 1989-09-11 Flexible hose construction and method of making the same

Publications (1)

Publication Number Publication Date
ES2084037T3 true ES2084037T3 (es) 1996-05-01

Family

ID=23603901

Family Applications (1)

Application Number Title Priority Date Filing Date
ES90914458T Expired - Lifetime ES2084037T3 (es) 1989-09-11 1990-08-30 Estructura de manguera flexible y procedimiento para su fabricacion.

Country Status (10)

Country Link
US (1) US5089074A (es)
EP (1) EP0491837B1 (es)
JP (1) JP3174884B2 (es)
KR (1) KR0171220B1 (es)
AT (1) ATE132426T1 (es)
AU (1) AU639266B2 (es)
CA (1) CA2066257C (es)
DE (1) DE69024656T2 (es)
ES (1) ES2084037T3 (es)
WO (1) WO1991003370A1 (es)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5256233A (en) * 1989-09-11 1993-10-26 Dayco Products, Inc. Flexible hose construction and method of making the same
US5148836A (en) * 1990-07-12 1992-09-22 Dayco Products, Inc. Flexible hose construction
US5275208A (en) * 1990-07-12 1994-01-04 Dayco Products, Inc. Flexible hose construction and method of making the same
US5494374A (en) 1992-03-27 1996-02-27 Youngs; Andrew Secondary containment flexible underground piping system
US5358358A (en) * 1993-02-17 1994-10-25 Dayco Products, Inc. System for conveying a fluid through an under-the-ground location and method of making the same
US5413147A (en) * 1993-04-29 1995-05-09 Parker-Hannifin Corporation Flexible hose and fitting assembly
US5398977A (en) * 1993-05-06 1995-03-21 Dayco Products, Inc. Concentric hose coupling with cuff assembly surrounding an end of the outer hose
US5848223A (en) * 1994-05-27 1998-12-08 Steward Plastics, Inc. Double-walled flexible tubing product with helical support bead and heating conductor and apparatus and method for making
CA2176464C (en) * 1994-09-15 2000-12-05 Michael C. Webb Pipe coupling assembly, system and method
US5678610A (en) * 1995-02-24 1997-10-21 Oem/Miller Corporation Composite tube and method of manufacture
US5678609A (en) * 1995-03-06 1997-10-21 Arnco Corporation Aerial duct with ribbed liner
DE29506541U1 (de) * 1995-03-30 1996-08-01 Robert Bosch Gmbh, 70469 Stuttgart Schutzvorrichtung für Elemente in Kraftfahrzeugen
US5865216A (en) 1995-11-08 1999-02-02 Advanced Polymer Technology, Inc. System for housing secondarily contained flexible piping
DE29710258U1 (de) * 1997-06-12 1997-08-07 BRUGG Rohrsysteme GmbH, 31515 Wunstorf Leitungsrohr für den Transport flüssiger oder gasförmiger Medien
DE19919715A1 (de) * 1999-04-30 2000-11-02 Witzenmann Metallschlauchfab Kältemittelleitung für Klimaanlagen
US7066497B2 (en) * 2003-11-07 2006-06-27 Wolfgang F. Fullbeck Fitting for a flexible metal hose
DE10354211B4 (de) * 2003-11-20 2005-09-15 Veritas Ag Schlauch mit Rippen aufweisender Innenschicht sowie dessen Verwendung
FR2878015A1 (fr) 2004-10-22 2006-05-19 Hutchinson Sa Flexible souple, notamment pour un circuit de climatisation de vehicule a moteur
US8733405B2 (en) 2005-03-14 2014-05-27 Advanced Drainage Systems, Inc. Corrugated pipe with outer layer
CA2622695C (en) * 2007-02-26 2015-11-03 Advanced Drainage Systems, Inc. Pipe extrusion die flow path apparatus and method
CA2622692C (en) * 2007-02-26 2015-10-06 Advanced Drainage Systems, Inc. Defined ratio dual-wall pipe die
US20080290538A1 (en) * 2007-05-23 2008-11-27 Biesenberger Jeffrey J Extruder ramp-up control system and method
US8820801B2 (en) * 2007-11-16 2014-09-02 Advanced Drainage System, Inc. Multi-wall corrugated pipe couplings and methods
US8820800B2 (en) * 2007-11-16 2014-09-02 Advanced Drainage Systems, Inc. Multi-wall corrugated pipe couplings and methods
US8114324B2 (en) 2008-10-14 2012-02-14 Advanced Drainage Systems, Inc. Apparatus and method for pressing an outer wall of pipe
US7988438B2 (en) * 2008-02-11 2011-08-02 Advanced Drainage Systems, Inc. Extrusion die vacuum seals
US8550807B2 (en) * 2008-05-28 2013-10-08 Advanced Drainage Systems, Inc. In-mold punch apparatus and methods
US9759354B2 (en) 2015-06-05 2017-09-12 Advanced Drainage Systems, Inc. Pipe with an outer wrap
CN108626518A (zh) * 2018-07-12 2018-10-09 福建华宏天城机电设备有限公司 一种化工管道保护装置
CN111619178B (zh) * 2020-05-14 2025-03-11 厦门美塑新质科技有限公司 一种卷心管及其制备方法
JP7829578B2 (ja) * 2020-12-08 2026-03-13 システムズ・プロテクション・グループ・ユー・エス・リミテッド・ライアビリティ・カンパニー 位置特定可能な保護スリーブ及びその構築方法

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
GB640760A (en) * 1948-08-05 1950-07-26 Flight Refueling Ltd Metal-lined hose
US2757690A (en) * 1952-05-06 1956-08-07 United Aircraft Corp Metal hose vibration damper
GB769993A (en) * 1953-05-18 1957-03-13 Millar John Humphrey Improvements in or relating to flexible corrugated metal hose
GB744435A (en) * 1953-10-22 1956-02-08 Pirelli General Cable Works Improvements in or relating to corrugated metal pipes
US3185182A (en) * 1964-11-16 1965-05-25 Dayco Corp Reinforced flexible conduit
GB1160805A (en) * 1967-07-08 1969-08-06 Engl Ltd J Improvements in or relating to Flexible Conduits
DE2127646A1 (de) * 1971-06-03 1973-01-04 Fraenk Isolierrohr & Metall Kunststoffrohr mit gewellter wandung
IT1012858B (it) * 1974-05-28 1977-03-10 Pirelli Struttura tubolare flessibile per il convogliamento di un fluido e relativo procedimento di fabbrica zione
DE2722928C2 (de) * 1977-05-20 1983-01-05 Hans Grohe Gmbh & Co Kg, 7622 Schiltach Flexibler Kunststoffschlauch
ES485447A0 (es) * 1978-11-02 1980-12-16 Hoechst Ag Perfeccionamientos en tuberias de combustible hechas de un sistema compuesto de plasticos.
US4415389A (en) * 1980-05-05 1983-11-15 Dayco Corporation Method of making a hose construction

Also Published As

Publication number Publication date
JP3174884B2 (ja) 2001-06-11
ATE132426T1 (de) 1996-01-15
EP0491837A1 (en) 1992-07-01
CA2066257C (en) 1999-06-15
EP0491837B1 (en) 1996-01-03
CA2066257A1 (en) 1991-03-12
KR920703311A (ko) 1992-12-17
JPH05502086A (ja) 1993-04-15
US5089074A (en) 1992-02-18
EP0491837A4 (en) 1992-08-12
AU639266B2 (en) 1993-07-22
DE69024656T2 (de) 1996-06-20
KR0171220B1 (ko) 1999-05-01
DE69024656D1 (de) 1996-02-15
WO1991003370A1 (en) 1991-03-21
AU6421690A (en) 1991-04-08

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