AU652541B2 - A concrete pipe with a lining resistant to corrosion and with fitting connecting members and furthermore with sealing means integrated in the terminal parts of the pipe - Google Patents

A concrete pipe with a lining resistant to corrosion and with fitting connecting members and furthermore with sealing means integrated in the terminal parts of the pipe Download PDF

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Publication number
AU652541B2
AU652541B2 AU64963/90A AU6496390A AU652541B2 AU 652541 B2 AU652541 B2 AU 652541B2 AU 64963/90 A AU64963/90 A AU 64963/90A AU 6496390 A AU6496390 A AU 6496390A AU 652541 B2 AU652541 B2 AU 652541B2
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Australia
Prior art keywords
pipe
corrosion resistant
concrete
pipes
seal
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Ceased
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AU64963/90A
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AU6496390A (en
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Georg Fasel
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Publication of AU6496390A publication Critical patent/AU6496390A/en
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Publication of AU652541B2 publication Critical patent/AU652541B2/en
Anticipated expiration legal-status Critical
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00Rigid pipes
    • F16L9/08Rigid pipes of concrete, cement, or asbestos cement, with or without reinforcement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B19/00Machines or methods for applying the material to surfaces to form a permanent layer thereon
    • B28B19/0038Machines or methods for applying the material to surfaces to form a permanent layer thereon lining the outer wall of hollow objects, e.g. pipes
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F3/00Sewer pipe-line systems
    • E03F3/04Pipes or fittings specially adapted to sewers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00Joints with sleeve or socket
    • F16L21/02Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/03Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed in the socket before connection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/185Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for joints with sleeve or socket

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Joints With Sleeves (AREA)

Abstract

In concrete pipes 2, having a corrosion-resistant inner lining, said lining is a plastic pipe 9 which is resistant to acidic sewage and whose one end part is constructed as a pipe tip end part 3, the other end being constructed as a pipe sleeve end part 4 for holding the tip end part 3, the plastic pipe projecting on its inner side in each case over the concrete pipe or the concrete surround 2, with an overhang 5, as an adjustment and connection aid for the perfect joining of the individual pipes to one another, it being possible to support their ends 9 on a circumferential step 8 on the inner wall 6 of the respectively following plastic pipe. Arranged between the plastic pipe sleeve end 12 and the step 8, in the inner wall 6, is a circumferential groove in which an annular seal 14, consisting for example of latex and the like, is mounted. Furthermore, annular seals 15 are also provided to ensure perfect sealing, in each case between the outer concrete walls 23 and the inner concrete walls 24. <IMAGE>

Description

652541 COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION NAME ADDRESS OF APPLICANT: Ulrike Fasel Gotthardsweg 17 D 5439 Nisterau 2 S. GCermany NAME(S) OF INVENTOR(S): Georg Fasel ADDRESS FOR SERVICE: DAVIES COLLISON Patent Attorneys 1 Little Collins Street, Melbourne, 3000.
COMPLETE SPECIFICATION FOR THE INVENTION ENTITLED: A concrete pipe with a lining resistant to corrosion and with fitting connecting members and furthermore with sealing means integrated in the terminal parts of the pipe The following statement is a full description of this invention, including the best method of performing it known to me/us:la The invention relates to a concrete pine with a corrosion resistant lining.
Pipes made of plastic and of concrete are presently on the market. In the first case the pipes are usually made entirely made of drawn plastic while pipes made of concrete are generally produced in a vertical mold with a sliding core. Drain systems are to a large extent built up using such pipes. The requirements they .have to meet in order not to present an environmental hazard are becoming more and more exacting so that it is hardly possible to meet such requirements at the present time. This is more 15 particularly due to the fact that the pipes corrode owing to the action of aggressive, acidic waste water and thus develop leaks and fail. Such corrosion however means that individual pipes constantly have to be replaced and finally all the pipes of a system have to be replaced, this being more often the case at 20 present than was the case a few years ago. In order to avoid such disadvantages there has already been a proposal to provide a concrete pipe combined with a plastic pipe. Since such pipes are normally laid like concrete pipes with the spigot end projecting -2into the socket end of the next following pipe so as to provide a rigid joining, such spigot end are very likely to be damaged. Furthermore, owing to their rigid jointing means and owing to lack of sufficient means for allowing for the possibility of thermal expansion of the plastic parts in relation tot he concrete part and the concrete pars in relation to the concrete parts on fitting the pipes together cracks are due to stress in the concrete material and/or bursting of the inserted pipe ends is likely so that such pipe parts are damaged for this reason and they have to be replaced by new pipes.
A preferred object of the present invention is to provide concrete pipes with a corrosion-resistant lining for drain purposes Which as compared with conventional piping are able to be made with lower material and production costs and are furthermore able to resist very aggressive, acidic sewage or waste water. A further preferred object of the invention if; to provide such a pipe with a connecting means ensuring a highly satisfactory action as regard sealing off the bore of the pie from the surroundings. A still further preferred aim of the invention is to provide a simple connection between a system made up of the novel pipes and a pre-existing pipe system, consisting for instance of plastic or concrete, cast iron, asbestos-cement material and the like so that strong and completely sealed joints are produced.
According to a first aspect of the present invention there is provided a pipe with a corrosion resistant lining arranged for connection. with a similar pipe, said pipe having socket means formed at a first end and spgo means formed at a second end, said corrosion resistant lining having a projecting part formed at said second :end and abutment means formed adjacent said first end, said abutment means extending radially into the interior of said pipe for a distance substantially equal to the thickness of the projecting part, and seal receiving means formed in the corrosion resistant lining between the abutment means and said first end, said pipe being arranged to be connected to an adjacent similar pipe by insertion of the spigot means of said adjacent pipe into the socket means of said pipe and insertion of the projecting part of said adjacent pipe into the interior of said pipe, said projecting part of said adjacent pipe being arranged to abut against the abutment means of said pipe, said seal receiving means of said pipe being arranged to receive a first seal means which is arranged to provide a seal between the projecting part of said Q1 940617,p:\oper\kay,61963-90.145,2 V-'7 I -3adjacent part and the corrosion resistant lining of said pipe, the connection between said pipes being such as to allow for movement resulting from thermally induced stresses in the pipes and to maintain good sealing between the corrosion resistant linings of said pipes.
According to a second aspect of the present invention there is provided a method of producing a pipe with a corrosion resistant lining as claimed in any one of the preceding claims comprising the steps of providing a corrosion resistant pipe with such a length that it has a projecting part projecting past an outwardly moved axial core of a conventional pipe making machine, placing a first end of the corrosion resistant pipe onto the core of in the pipe making machine, placing a pipe mold over the length of the core such that a space is formed between the pipe mold and the corrosion resistant pipe, said space having a thickness equal to the thickness of the pipe to be molded, covering the opening of the corrosion resistant pipe, pouring mold material into the space until it reaches the level of the core so that after drying of the mold material a pipe formed with a socket means is provided and the projecting part is left without any mold material around it.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 shows a plurality of laid pipes diagrammatically in partial section.
Figure 2 is a view of part of a piece of pipe forming part of a connection between two laid pipes as seen in perspective.
Figure 3 is a view of a pipe joint between two 940617.p:\oper\ky,64963-90.145,3
*O
*O
*O
o 3 -4pipes in a smaller scale, in the case of which a concrete and plastic pipe is to be seen with a length of plastic pipe projecting from it.
Figure 4 is a diagrammatic representation of the method steps involved in the production of a concrete pipe provided with a plastic lining and having such .plastic pipe projecting at one end.
Figure 1 shows a plastic pipe 1 provided with a concrete pipeeaszig 2, the plastic pipe serving as a corrosion resistant, liquid-tight lining of the concrete pipe one end of same being the form of a pipe spigot end part 3 and the other end being in the form of a pipe socket end part 4, and with the end parts 3 and 4 the concrete pipes are joined together. In this respect the pipe spigot end part 3 of the one pipe is inserted into the pipe socket end part,of the other pipe. As a guiding means for aiding insertion there is a projecting part 5 of the plastic pipe 1 projecting past the concrete pipe 2 and, respectively, its concrete casing 2 at the pipe spigot end part. In order secure the two pipes to be joined together the inner wall face 6 of the pipy socket end part 4 is provided with a circumferential ledge 8 projecting into the interior 7 of the pipe and the end face 9 of the projecting part 5 of the plastic pipe is able to be brought into engagement with the ledge. It is convenient if the end face 9 and the ledge 8 extend in the direction of flow of the sewage water to be conveyed by the pipe in order to avoid back pressure if dirt should collect adjacent to the gap. In this respect the height of the ledge 8 is generally equal to the wall thickness 11 of the plastic pipe 1 forming the projecting part. Furthermore in the pipe socket end part 4 of the plastic pipe there is, between the plastic pipe socket end and the ledge 8, a groove 13 opening into the interior 7 of the pipe and extending in the circumferential direction, such groove serving to receive an annular and preferably flat seal of a natural or synthetic flexible material, as for example a latex. The flat annular form is to be preferred to a round one since it will be seated in a fixed and stable manner in the groove 13 which is preferably of rectangular in cross section. The projecting part 5, which is able to be inserted into the pipe socket end part, has to be so long in this connection that on the one hand it covers the circumferential groove its seal 14 and on the other hand the end face 9 is able to bear against the C. ledge 8, see figure 2. It is furthermore to be noted that the 10 concrete pipe members have a circumferentially extending, annular seal 15 of flexible material between the concrete pipe spigot end part 3 on the outside 23 and the concrete socket end part 4 on the inner side at 24. The plastic pipes may in a suitable form and size be inserted into the concrete pipe with a suitable inner form in relation to the plastic pipe with a suitable size. It is an advantage if the composite pipe is manufactured with all its .000 features as described above in a conventional pipe casting or C4*C° o molding machine 16, after the manufacture of the plastic pipe able to be used as the core. For this purpose the concrete pipe with the socket end part directed downwards is moved onto the axially extending and vertically movable core 17 of the pipe molding machine so that the pipe takes up a concentric position on the *core. In this respect the plastic pipe has to be so long that it projects past the core of the pipe making machine in its outwardly moved terminal setting by the preset projecting part 5. After introduction of the core into the opening of the pipe 19 the latter is covered over by a lid 20 in order in the ensuing coating process of thr. concrete pipe with a concrete mix to ensure that none of the concrete material finds its way into the interior of the pipe.
Following this a pipe mold 18 of steel is introduced into the length of the core of the pipe making machine with a clearance in the desired thickness of concrete pipe body to be molded or cast and also pushed downwards and after being pushed on the pipe mouth is covered over. Then the space '12 between the pushed on plastic -6pipe 2 and the inner wall face of the steel mold 18 concrete 22 is filled in downwards while shaking until the level of the core end 21 is reached. After drying of the molding and shifting it out of the molding machine there will be a concrete-plastic pipe, in the case of which a plastic pipe end part without any concrete casing projects out of the end in the form of the projecting part 5 of the plastic pipe, see figure 4.
The composite pipes able to be produced in accordance with the invention only need a small amount of seals 14 and sealing means 15 to provide not only a very satisfactory sealing action to prevent the leakage of liquid out of the pipe, but also, owing to the projecting pipe at every pipe end there is also an overlapping and direction connection without intermediate parts of the concrete pipe plastic composite pipes with each other. The flexible sealing and gaskefting means 14 and 15 used in this respect means that there is considerable freedom to move in the axial and lateral directions for the expansion and contraction of the pipes at their joints and also to allow for relative motion between the concrete pipe and the plastic coating so that any stresses due to the effects of heat or variations in temperature, which might lead to cracking or even splitting of the pipes are allowed for. Furthermore the intermediate connecting members needed for joining and sealing of the connected parts where the ends of the pipes are adjacent to each other, as for instance in the case of a known composite 25 concrete plastic pipe, are now no longer required owing to the direct pipe joint with an overlap.
Throughout this specification and the claims which follows, unless the context requires otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
0.*0.
0

Claims (6)

1. A pipe with a corrosion resistant lining arranged for connection with a similar pipe, said pipe having socket means formed at a first end and spigot means formed at a second end, said corrosion resistant lining having a projecting part formed at said second end and abutment means formed adjacent said first end, said abutment means extending radially into the interior of said pipe for a distance substantially equal to the thickness of the projecting part, and seal receiving means formed in the corrosion resistant lining between the abutment means and said first end, said pipe being arranged to be connected to an adjacent similar pipe by insertion of the spigot means of said adjacent pipe into the socket means of said pipe and insertion of the projecting part of said adjacent pipe into the interior of said pipe, said projecting part of said adjacent pipe being arranged to abut against the abutment means of said pipe, said seal receiving means of said pipe being arranged to receive a first seal means which is arranged to provide a seal between the projecting part of said adjacent part and the corrosion resistant lining of said pipe, the connection between said pipes being such as to allow for movement resulting from thermally induced stresses in the pipes and to maintain good sealing between the corrosion resistant linings of said pipes.
2. A pipe according to claim 1 further comprising second seal means arranged to provide a seal between the spigot means of said adjacent pipe and the socket means of said pipe. '25 3. A pipe according to claim 1 or claim 2 wherein the seal receiving means comprises a circumferential groove and the first seal means comprises an elastomeric sealing ring.
4. A pipe according to claim 3 wherein the groove has a rectangular cross- "30 section and the sealing ring has a substantially flat external form so as to enable the sealing ring to be seated in the groove. 9 tKi 17,p: \opcr\kay,6A963 90.145,7 -8- A pipe according to any one of the preceding claims which is made from concrete.
6. A pipe according to any one of the preceding claims wherein the corrosion resistant lining is made from a plastics material.
7. A method of producing a pipe with a corrosion resistant lining as claimed in any one of the preceding claims comprising the steps of providing a corrosion resistant pipe with such a length that it has a projecting part projecting past an outwardly moved axial core of a conventional pipe making machine, placing a first end of the corrosion resistant pipe onto the core of in the pipe making machine, placing a pipe mold over the length of the core such that a space is formed between the pipe mold and the corrosion resistant pipe, said space having a thickness equal to the thickness of the pipe to be molded, covering the opening of the corrosion resistant pipe, pouring mold material into the space until it reaches the level of the core so that after drying of the mold material a pipe formed with a socket means is provided and the projecting part is left without any mold material around it.
8. A pipe or a method of producing the same substantially as hereinbefore described with reference to the accompanying drawings. 9 S Dated this 17th day of June, 1994 D25 ULRIKE FASEL By his Patent Attorneys DAVIES COLLISON CAVE *J o oo *o• *o 9406 17,p:\opcrkay,6-'963-90.145,8
AU64963/90A 1989-11-03 1990-10-24 A concrete pipe with a lining resistant to corrosion and with fitting connecting members and furthermore with sealing means integrated in the terminal parts of the pipe Ceased AU652541B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE8913022U DE8913022U1 (en) 1989-11-03 1989-11-03 CONCRETE PIPE WITH A CORROSION-RESISTANT INTERNAL LINING WITH FIT-FITTED PIPE JOINTS AND SEALING ARRANGEMENTS INTEGRATED WITH THE PIPE AREAS
DE3936671 1989-11-03
DE3936671 1989-11-03

Publications (2)

Publication Number Publication Date
AU6496390A AU6496390A (en) 1991-05-09
AU652541B2 true AU652541B2 (en) 1994-09-01

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Application Number Title Priority Date Filing Date
AU64963/90A Ceased AU652541B2 (en) 1989-11-03 1990-10-24 A concrete pipe with a lining resistant to corrosion and with fitting connecting members and furthermore with sealing means integrated in the terminal parts of the pipe

Country Status (9)

Country Link
EP (1) EP0426147B1 (en)
AT (1) ATE133485T1 (en)
AU (1) AU652541B2 (en)
CA (1) CA2029144A1 (en)
DE (3) DE8913022U1 (en)
DK (1) DK0426147T3 (en)
ES (1) ES2081896T3 (en)
GR (1) GR3018822T3 (en)
HR (1) HRP940594A2 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8913022U1 (en) * 1989-11-03 1990-02-22 Fasel, geb. Willwacher, Ulrike, 5439 Nisterau CONCRETE PIPE WITH A CORROSION-RESISTANT INTERNAL LINING WITH FIT-FITTED PIPE JOINTS AND SEALING ARRANGEMENTS INTEGRATED WITH THE PIPE AREAS
DE4025603A1 (en) * 1990-08-13 1992-02-20 Pt Poly Tec Gmbh CONCRETE PIPE
DE4127992A1 (en) * 1991-08-23 1993-02-25 Huels Troisdorf CONCRETE PLASTIC COMPOSITE PIPE, METHOD FOR THE PRODUCTION THEREOF AND ITS USE AS A DRIVE TUBE
AT398819B (en) * 1991-12-10 1995-02-27 Harreither Raimund ARRANGEMENT FOR HEATING AND SANITARY INSTALLATION WITH AT LEAST ONE PIPE ELEMENT AND AT LEAST ONE FITTING
DE9405242U1 (en) * 1994-03-28 1994-05-26 Schmalz & Weißgerber GmbH, 36341 Lauterbach Bell socket pipe made of concrete for sewer construction
DE29700398U1 (en) * 1997-01-11 1997-03-13 REHAU AG + Co., 95111 Rehau Concrete pipe with plastic inner lining
DE19801019B4 (en) * 1998-01-14 2006-11-30 Funke Kunststoffe Gmbh Sealing plug connection
DE10109415A1 (en) * 2001-02-27 2002-09-12 Funke Kunststoffe Gmbh Pipe joint comprises a socket lining element provided with inner and outer collars, and a groove for a ring sealing element which is compressed when the pipes are assembled
DE202004003139U1 (en) * 2004-03-01 2005-07-28 Gebr. Fasel Betonwerk Gmbh Concrete pipe with corrosion-resistant inner lining
DE202008006134U1 (en) 2008-05-05 2009-09-17 Gebr. Fasel Betonwerk Gmbh Duct system with testing device
CN101586722B (en) * 2008-05-25 2010-08-18 刘文多 Cement pipe connecting member
US9551449B2 (en) 2010-05-26 2017-01-24 Lmk Technologies, Llc Method for creating a seal between pipe liners
DE202010015759U1 (en) 2010-11-23 2012-03-01 Gebr. Fasel Betonwerk Gmbh Concrete pipe with corrosion-resistant inner lining
CN104455827B (en) * 2014-10-29 2016-08-17 中国水利水电第十工程局有限公司 Pressure backfill formula pipe connections
CN113389943B (en) * 2021-04-23 2022-07-15 浙江五联建设有限公司 Municipal drainage pipeline construction technology
CN115126940B (en) * 2022-06-27 2024-04-05 安徽华奇管业有限公司 Assembled PP inner wall reinforced concrete composite pipe and production process thereof

Citations (2)

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Publication number Priority date Publication date Assignee Title
AU286248B2 (en) * 1963-05-02 1965-11-04 Colour television receiver
AU465991B2 (en) * 1970-12-30 1973-05-24 Improvements in concrete pipes andthe uke

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Publication number Priority date Publication date Assignee Title
DE8132729U1 (en) * 1981-11-09 1982-07-15 Pebüso-Betonwerke Heribert Büscher GmbH & Co, 4400 Münster "CONCRETE SOCKET PIPE OR THE LIKE."
DE8505653U1 (en) * 1985-02-27 1985-07-04 Fa. Leonhard Gollwitzer, 8481 Mantel Concrete pipe for use in or for the transport of aggressive fluids
DE8714664U1 (en) * 1987-10-30 1988-01-14 Eternit Ag, 1000 Berlin Plug-in connection for sewer pipes with inner lining made of fibre cement
DE8806158U1 (en) * 1988-05-09 1989-02-02 Fasel, Georg, Dipl.-Ing., 5439 Nisterau Pipe or similar moulded part made of concrete with a corrosion-resistant inner lining and with a partially flexible composite
DE8913022U1 (en) * 1989-11-03 1990-02-22 Fasel, geb. Willwacher, Ulrike, 5439 Nisterau CONCRETE PIPE WITH A CORROSION-RESISTANT INTERNAL LINING WITH FIT-FITTED PIPE JOINTS AND SEALING ARRANGEMENTS INTEGRATED WITH THE PIPE AREAS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU286248B2 (en) * 1963-05-02 1965-11-04 Colour television receiver
AU465991B2 (en) * 1970-12-30 1973-05-24 Improvements in concrete pipes andthe uke
AU482875B2 (en) * 1974-04-18 1976-05-27 Interpace Corporation Structural polyurethane foam system withan inorganic alkaline sealant suspended therein

Also Published As

Publication number Publication date
DK0426147T3 (en) 1996-02-12
EP0426147A2 (en) 1991-05-08
EP0426147B1 (en) 1996-01-24
EP0426147A3 (en) 1992-11-19
GR3018822T3 (en) 1996-04-30
DE4034953A1 (en) 1991-05-08
DE4034953C2 (en) 1996-01-25
HRP940594A2 (en) 1996-04-30
ES2081896T3 (en) 1996-03-16
ATE133485T1 (en) 1996-02-15
CA2029144A1 (en) 1991-05-04
DE8913022U1 (en) 1990-02-22
AU6496390A (en) 1991-05-09
DE59010086D1 (en) 1996-03-07

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