EP0699112B1 - Vorrichtung zur zufuhr einer metallschmelze, insbesondere gusseisen, bei einer giessmaschine, sowie giessmachine ausgerüstet mit dergleiche schmelzzuführung - Google Patents

Vorrichtung zur zufuhr einer metallschmelze, insbesondere gusseisen, bei einer giessmaschine, sowie giessmachine ausgerüstet mit dergleiche schmelzzuführung Download PDF

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Publication number
EP0699112B1
EP0699112B1 EP94916280A EP94916280A EP0699112B1 EP 0699112 B1 EP0699112 B1 EP 0699112B1 EP 94916280 A EP94916280 A EP 94916280A EP 94916280 A EP94916280 A EP 94916280A EP 0699112 B1 EP0699112 B1 EP 0699112B1
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EP
European Patent Office
Prior art keywords
siphon
feed device
casting
molten metal
casting machine
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
EP94916280A
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English (en)
French (fr)
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EP0699112A1 (de
Inventor
Claude Rotharmel
Yvon Gallo
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.)
Pont a Mousson SA
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Pont a Mousson SA
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Publication date
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Publication of EP0699112A1 publication Critical patent/EP0699112A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D35/00—Equipment for conveying molten metal into beds or moulds
    • B22D35/06—Heating or cooling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • B22D11/145—Plants for continuous casting for upward casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D35/00—Equipment for conveying molten metal into beds or moulds
    • B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
    • B22D35/045—Runner base plates for bottom casting ingots

Definitions

  • the present invention relates to the casting of molten metals, and more particularly to the continuous vertical casting of metal parts, in particular of cast iron tubes. Although it applies to the casting of different types of metal parts, it is particularly advantageous for the casting of thin cast iron tubes.
  • thin tube applies to a tube with a low thickness / diameter ratio, less than ten percent, rather than the thickness considered in itself.
  • the invention relates more precisely to a device for supplying molten metal to a casting machine, in particular for an installation for continuous vertical upward casting of cast iron tubes, said supply device being disposed between a source of molten metal. and the casting machine (see: FR-A-2 258 919).
  • the source of molten metal is typically a cast iron ladle and the casting machine an upward continuous casting machine for metal parts, of the vertical die type.
  • the invention therefore relates to an intermediate link of a casting installation arranged between the source of molten metal and the device for casting metal parts as such.
  • the document FR-A-2,547,517 relating to a vertical continuous casting installation with a hot inlet die for the casting of metal tubes has already described a device for supplying liquid iron, placed between a ladle and a vertical die .
  • This supply device comprises a siphon block consisting of a single piece made of a refractory material of the silico-aluminous type or of graphite.
  • This siphon block has a vertical chimney surmounted by a funnel for receiving the cast iron and a horizontal runner tightly connected to the lower end of the die to which it serves as a base or support.
  • This siphon block poses a certain number of problems. Indeed, given the high temperatures involved in the casting of molten metals, the siphon block is quickly damaged during the continuous casting process.
  • a graphite siphon in addition to its relatively high cost, is gradually worn and / or consumed by the molten iron which is in contact with it.
  • a siphon block in one piece is a relatively massive part of a difficult implementation, which also complicates the handling required when replacing the siphon. The consumption of graphite can cause a change in the composition of the cast iron, outside of the desired analysis.
  • the object of the present invention is to remedy the drawbacks presented by known devices for supplying molten metal, and in particular by siphon blocks as known in the state of the art.
  • the subject of the invention is therefore a device for supplying molten metal to a casting machine, in particular for an installation of continuous vertical upward casting of cast iron tubes, said supply device being arranged between a source of metal. in fusion and the casting machine, this device being characterized in that it has a modular structure comprising on the one hand a siphon for supplying molten metal from the metal source to the casting machine, and on the other part of the removable siphon heating plates, arranged around it and in contact with it.
  • the invention also relates to an installation for casting metal parts, in particular for vertical upward continuous casting of tubes in cast iron, characterized in that it comprises a device for supplying molten metal as defined above.
  • the supply device 1 properly speaking consists of a siphon block 3 substantially in the shape of an L.
  • This siphon block 3 is essentially made in one piece from a refractory material of the silico-aluminous type or from graphite.
  • the siphon block 3 includes a supply chimney 4 terminated at its upper part by a flare 5 in the form of a funnel.
  • the horizontal part 6 of the siphon block incorporates a horizontal pouring channel 7 opening on one side into the supply chimney 4, and on the other side in a portion of ascending vertical channel 8 ending in a frustoconical flare 9 opening into the lower part 10 of the die.
  • the die essentially consists of a cylindrical tube 11 made of graphite, surrounded at its lower part 10 by a refractory ring 12 in which are embedded the cables 13 of an inductor circuit intended to keep the liquid metal above its point of fusion.
  • the die 2 is surrounded in its upper part 14 by a cooling circuit 15 which allows a gradual solidification of the molten iron for the formation of tubes.
  • a ladle P constitutes the source of molten cast iron for the feed device 1, which in turn feeds the die 2.
  • the siphon block 3 of this supply device 1 is the element which poses the problems which the present invention proposes to solve. Indeed, this block in one piece is difficult to handle and install, and a high cost, especially when made of graphite. In addition, it gradually deteriorates during casting by wear or consumption under the action of molten iron. Consequently, in this supply device 1 according to the state of the art, the siphon block 3 must be replaced in its entirety as soon as a certain number of tubes have been poured.
  • This Figure illustrates a device 1 for supplying molten metal according to the invention.
  • the invention will be described in the context of a continuous casting device for cast iron tubes similar to the device in FIG. 1, supplying a die 2, but only by way of example.
  • the invention provides a modular supply device, a centerpiece of which is an interchangeable siphon and of very low cost.
  • the invention can be implemented in the context of casting installations using metals other than cast iron, or with devices for forming parts which are not dies for forming tubes, the invention will be described below, for the sake of clarity and simplicity, in the context of a vertical ascending continuous casting installation of cast iron tubes, obtained using a die.
  • the supply device 1 mainly comprises a siphon 3, means for heating the siphon 3 in the form of hot plates 16 arranged all around the siphon except at its entry and exit, a carcass 17 provided an inductor 18, in which the siphon 3 and the heating plates 16 are placed, and finally, a filling, insulation and protection material 19 disposed in the space left free between the stack formed by the siphon 3 and the hot plates 16, and the carcass 17.
  • the siphon 3 is shown in more detail in Figures 4 and 5. It is a substantially U-shaped part molded from a low-cost refractory material, in particular refractory concrete.
  • the siphon 3 comprises a part 3A with a square section provided with a vertical downward channel 20 entering the molten iron, a part 3B with a square section provided with a channel horizontal 21 into which opens a second vertical channel 22 directed upwards, much shorter than channel 20, communicating with channel 21 and having a frustoconical part 3C; this part 3C ensures the tight centering of the conjugate lower part 10A of the heating base 10 of the die ( Figure 2). It should be noted that part 3B extends a little beyond part 3A, which defines a horizontal shoulder 23.
  • This siphon 3 being obtained by molding with a core, the two end holes 24 of the horizontal channel 21 which result from the molding are plugged with the aid of a refractory earth which is groomed manually.
  • the siphon 3 consequently comprises an inlet orifice 25 and an outlet orifice 26 of the cast iron.
  • provision may be made for the insertion of instruments for measuring the temperature of the cast iron inside the siphon, in the form of a thermocouple placed in an alumina sheath (not shown), the assembly being inserted into the hole before filling.
  • This siphon molded in refractory concrete makes it an extremely economical part, of consumable nature, intended to be replaced after each casting campaign.
  • this funnel 5 has a conical internal shape, the lower part of which opens into the vertical channel 20, of the same diameter, for the entry of liquid iron into the siphon.
  • the funnel 5 is also molded from refractory concrete, preferably identical to that of the siphon. In order to ensure sealing between the funnel 5 and the siphon 3, the funnel is bonded to the siphon with a refractory cement.
  • the funnel 5 is a consumable and economical part, intended to be replaced at the end of one or more of several casting campaigns.
  • the funnel 5 is surmounted by a funnel-channel 26 of refractory cement, not consumable, having a larger opening for the reception of the poured cast iron.
  • the supply device 1 also comprises a set of heating plates 16, intended to maintain the liquid iron temperature, by conduction through the material of the siphon.
  • These heating plates also called susceptors, which can themselves be heated by induction
  • the invention provides for example graphite plates with a thickness of the order of 30 mm, placed directly in contact with the refractory material of the siphon of so as to enclose it with lower, upper, and side plates, as shown in Figure 3, with the exception of the inlet 25 and outlet 26 of the siphon.
  • the graphite on the plates 16 makes it possible to preheat the siphon 3 by induction, in a homogeneous and controllable manner, to temperatures of the order of 1000 ° C.
  • a base plate 16A is used under the siphon 3, projecting laterally on each side of the part 3B, two vertical side plates 16B attached to the part 3B and placed on the edges of the plate 16A , an upper plate 16C placed on part 3B, and four vertical plates 16D attached to part 3A of the siphon and placed respectively on plate 16C, on shoulder 23 and on the upper edge of plates 16B.
  • the stack formed by the graphite susceptor plates 16, the siphon 3 and the funnel 5 is disposed on an alignment of refractory bricks 27.
  • a carcass 17 of refractory material is arranged around this stack, so as to leave free a space 28 between the stack and the carcass 17.
  • inductor windings 18 are embedded in the thickness of the carcass 17, and supplied with electric current from an external generator not shown.
  • the carcass comprises a main part 17A which surrounds the part 3B of the siphon and protrudes above it, and an extension 17B which surrounds the upper part of the part 3A and protrudes above it.
  • the space 28 between the carcass 17 and the stack formed by the siphon 3 and the heating plates 16 is filled with a filling material 19 providing a function of thermal insulation and chemical protection of the heating elements against oxidation.
  • the space 28 is preferably filled with fine foundry sand, simply poured between the carcass 17 of the inductor and the siphon 3 equipped with the plates 16. The sand flows into the space 28, which '' it fills perfectly, completely enclosing the graphite heating plates 16 and the siphon 3 for optimal protection of the supply device 1. This sand, which does not hinder the removal of the carcass 17 during disassembly of the supply device 1, can be recovered and recycled after each casting campaign.
  • refractory bricks 29 for insulating and retaining the sand are placed on the plate 16C and are inserted under the extension 17B of the carcass 17.
  • an inductor auxiliary 30 is arranged around the base of the die 2.
  • the use of the cast iron supply device 1 according to the invention takes place in the following manner.
  • a support which can be an elevating table 31
  • the bricks 27 are placed then the lower heating plate 16A.
  • the siphon 3 of refractory concrete On this lower plate is placed the siphon 3 of refractory concrete, then the stacking and positioning of the remaining plates 16 is completed as shown in Figure 3.
  • the different heating plates are encircled by a retaining means, in particular an adhesive tape.
  • the bricks 29 are placed, and the carcass 17 provided with its inductor means 18 intended for preheating the siphon 3 via the heating plates, is brought, typically using an overhead crane.
  • the carcass 17 is filled with sand 19 so that all the parts possibly made of graphite are covered.
  • the inductor 30 is put in place, and the funnel 5 is bonded above the inlet orifice 25 of the siphon 3, and the die 2 is bonded to the part 3C thereof, at the using refractory cement.
  • the preheating inductor 18 is connected to its electrical supply box (not shown) and the preheating of the supply device 1 is started.
  • the hot plates playing the role of armature heat up, and in turn heat the siphon 3, while remaining thermally insulated and against oxidation by the sand 19 and the bricks 29.
  • Preheating the device may take one to three hours, depending on the power of the inductor circuit.
  • the preparation of the feed device 1 before casting will advantageously be completed by the blackening of the various passage zones of the liquid iron, in order to avoid sticking of drops and tongues of solid iron during casting.
  • the feed device 1 according to the invention is dismantled by successively removing the funnel 5 and the funnel-channel 26, the bricks 29, the carcass 17, the sand 19, the hot plates 16 and siphon 3. The latter will be eliminated and replaced by a new siphon.
  • the supply device 1 according to the invention perfectly meets the objectives set.
  • the invention can also be applied to the casting of solid bodies, such as bars.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Heat Treatment Of Articles (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Feeding Of Articles To Conveyors (AREA)
  • General Induction Heating (AREA)

Claims (11)

  1. Vorrichtung (1) zur Beschickung einer Gießmaschine (2) mit schmelzflüssigem Metall, vorzugsweise für eine Einrichtung zum kontinuierlichen, vertikalen, steigenden Gießen von Werkstücken, insbesondere von Rohren, aus Gußeisen, wobei die genannte Beschickungsvorrichtung (1) zwischen einer Quelle (P) von schmelzflüssigem Metall und der Gießmaschine (2) angeordnet ist und diese Vorrichtung dadurch gekennzeichnet ist, daß sie einen modularen Aufbau (3, 16) darbietet, der einerseits einen Lauf (3) zur Zufuhr des schmelzflüssigen Metalls der Metallquelle (P) zur Gießmaschine (2) und andererseits entfernbare Platten (16) zur Beheizung des Laufes (3) aufweist, die rund um diesen und in Berührung mit diesem angeordnet sind.
  2. Beschickungsvorrichtung (1) nach Anspruch 1, dadurch gekennzeichnet, daß der genannte Lauf (3) ein auswechselbares Teil ist, das vorzugsweise aus feuerfestem Guß- bzw. Schüttbeton ausgeführt ist.
  3. Beschickungsvorrichtung (1) nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß der Lauf (3) ein im wesentlichen U-förmiges Teil ist, mit einem ersten, im wesentlichen vertikalen Kanal (20), der nach oben in einer Einlaßöffnung (24) für das schmelzflüssige Metall endet, einem zweiten, im wesentlichen vertikalen Kanal (22), der an der Unterseite der Gießmaschine (2) mit einer Auslaßöffnung (26) für das schmelzflüssige Metall einmündet, und einem im wesentlichen horizontalen Kanal (21), der die vertikalen Kanäle (20, 22) miteinander verbindet.
  4. Beschickungsvorrichtung (1) nach Anspruch 3, dadurch gekennzeichnet, daß das Teil rund um den zweiten Kanal (22) eine kegelstumpfartige Form (3C) aufweist, die dazu bestimmt ist, als dichte Verbindung mit der zugeordneten Unterseite (10A) der Gießmaschine (2) zusammenzuwirken.
  5. Beschickungsvorrichtung (1) nach irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß sie außerdem einen Rahmen (17) aus feuerfestem Material aufweist, der den Lauf (3) und die Beheizungsplatten (16) derart umgibt, daß ein Raum (28) zwischen der Innenseite des Rahmens (17) und den Beheizungsplatten (16) freibleibt, wobei der genannte Raum (28) mit einem wärmeisolierenden und chemisch schützenden Material (19) ausgefüllt ist.
  6. Beschickungsvorrichtung (1) nach Anspruch 5, dadurch gekennzeichnet, daß der Rahmen (17) Mittel (18) zur Beheizung der Beheizungsplatten (16) aufweist, die vorzugsweise von einem Induktionskreis (18) gebildet sind, der in den Rahmen (17) eingelassen ist, wobei die Beheizungsplatten (16) als Sekundärkörper dienen.
  7. Beschickungsvorrichtung (1) nach Anspruch 5 oder Anspruch 6, dadurch gekennzeichnet, daß das wärmeisolierende und chemisch schützende Material (19) feiner Formsand ist.
  8. Beschickungsvorrichtung (1) nach irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Beheizungsplatten (16) aus Graphit bestehen.
  9. Beschickungsvorrichtung (1) nach irgendeinem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Lauf (3) und die Beheizungsplatten (16), die den Lauf (3) umgeben, auf feuerfesten Ziegeln (27) aufgeschichtet sind.
  10. Beschickungsvorrichtung (1) nach irgendeinem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Lauf (3) ebene Anlageflächen für jede Beheizungsplatte (16) aufweist.
  11. Einrichtung zum Gießen von Werkstücken aus Metall, vorzugsweise zum kontinuierlichen, vertikalen, steigenden Gießen von Rohren aus Gußeisen, dadurch gekennzeichnet, daß sie eine Beschickungsvorrichtung (1) für schmelzflüssiges Metall nach irgendeinem der vorangehenden Ansprüche aufweist.
EP94916280A 1993-05-19 1994-05-11 Vorrichtung zur zufuhr einer metallschmelze, insbesondere gusseisen, bei einer giessmaschine, sowie giessmachine ausgerüstet mit dergleiche schmelzzuführung Expired - Lifetime EP0699112B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9306063 1993-05-19
FR9306063A FR2705259B1 (fr) 1993-05-19 1993-05-19 Dispositif d'alimentation en métal en fusion, notamment en fonte, d'une machine de coulée, et installation de coulée intégrant ce dispositif d'alimentation.
PCT/FR1994/000570 WO1994026444A1 (fr) 1993-05-19 1994-05-11 Dispositif d'alimentation en metal en fusion, notamment en fonte, d'une machine de coulee, et installation de coulee integrant ce dispositif d'alimentation

Publications (2)

Publication Number Publication Date
EP0699112A1 EP0699112A1 (de) 1996-03-06
EP0699112B1 true EP0699112B1 (de) 1997-02-26

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EP94916280A Expired - Lifetime EP0699112B1 (de) 1993-05-19 1994-05-11 Vorrichtung zur zufuhr einer metallschmelze, insbesondere gusseisen, bei einer giessmaschine, sowie giessmachine ausgerüstet mit dergleiche schmelzzuführung

Country Status (31)

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US (1) US5732763A (de)
EP (1) EP0699112B1 (de)
JP (1) JP2837275B2 (de)
KR (1) KR960702365A (de)
CN (1) CN1061277C (de)
AT (1) ATE149107T1 (de)
AU (1) AU683263B2 (de)
BG (1) BG100162A (de)
BR (1) BR9406304A (de)
CA (1) CA2163214A1 (de)
CU (1) CU22408A3 (de)
CZ (1) CZ283046B6 (de)
DE (1) DE69401814T2 (de)
DK (1) DK0699112T3 (de)
DZ (1) DZ1780A1 (de)
EG (1) EG20391A (de)
ES (1) ES2101535T3 (de)
FI (1) FI955549A (de)
FR (1) FR2705259B1 (de)
GR (1) GR3022812T3 (de)
HR (1) HRP940309A2 (de)
HU (1) HUT75913A (de)
MA (1) MA23195A1 (de)
MX (1) MX9403677A (de)
PL (1) PL311694A1 (de)
RU (1) RU2111830C1 (de)
SK (1) SK142395A3 (de)
TN (1) TNSN94047A1 (de)
WO (1) WO1994026444A1 (de)
YU (1) YU28294A (de)
ZA (1) ZA943423B (de)

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FR2751249B1 (fr) * 1996-07-17 1998-09-04 Pont A Mousson Dispositif de positionnement d'un bloc-filiere d'une table de coulee d'une machine de coulee continue verticale ascendante
FR2751250B1 (fr) 1996-07-17 1998-08-21 Pont A Mousson Dispositif de bridage d'une table de coulee d'une machine de coulee continue verticale de pieces, en particulier de tubes, en fonte
DE19900574A1 (de) * 1999-01-09 2000-07-13 Georg Fischer Disa Ag Verfahren und Vorrichtung zum steigenden Gießen von Leichtmetall
US6973955B2 (en) * 2003-12-11 2005-12-13 Novelis Inc. Heated trough for molten metal
CN101468385B (zh) * 2007-12-29 2010-11-24 中国船舶重工集团公司第七二五研究所 一种可用来制取金属粉末及铸件的金属液联动输送装置
EP2928629A4 (de) * 2012-11-30 2016-05-18 Martin Eriksson Arrangement zum giessen aus der unterseite eines metalls/stahls
AT515244A2 (de) * 2013-12-30 2015-07-15 Inteco Special Melting Technologies Gmbh Verfahren zur Herstellung von langen Gussblöcken großen Querschnitts
CN105689669A (zh) * 2016-03-21 2016-06-22 安徽鑫旭新材料股份有限公司 一种铜材自动加料的上引连铸机
FR3050390B1 (fr) * 2016-04-26 2020-01-24 Roctool Procede et dispositif pour le moulage en coquille d’un alliage metallique
WO2018067164A1 (en) * 2016-10-07 2018-04-12 Hewlett-Packard Development Company, L.P. Injection molding with multiple gates
CN110090919A (zh) * 2019-03-12 2019-08-06 江苏圣大中远电气有限公司 铝青铜铸件熔融铸造工艺
CN112091187B (zh) * 2020-08-31 2021-08-24 帅翼驰(河南)新材料科技有限公司 一种铝锭连铸生产线浇铸装置

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US2875991A (en) * 1956-01-09 1959-03-03 Donald R Ruegsegger Humidifier
DE2362702C3 (de) * 1974-01-07 1978-03-09 Uralskij Ordena Trudovogo Krasnogo Znameni Politechnitscheskij Institut Imeni S.M. Kirova, Swerdlowsk (Sowjetunion) Vorrichtung zum Zuführen, Fördern und Dosieren einer Metallschmelze zu einer Stranggießkokille
GB1483517A (en) * 1974-11-06 1977-08-24 Gravicast Patent Gmbh Method of casting
FR2573683B1 (fr) * 1984-11-26 1987-01-02 Pont A Mousson Installation d'alimentation en metal liquide avec controle de temperature du metal liquide pour la coulee continue d'un tuyau en fonte

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MX9403677A (es) 1995-01-31
KR960702365A (ko) 1996-04-27
CU22408A3 (es) 1996-01-31
JPH08506275A (ja) 1996-07-09
EP0699112A1 (de) 1996-03-06
DZ1780A1 (fr) 2002-02-17
CZ283046B6 (cs) 1997-12-17
SK142395A3 (en) 1997-10-08
BR9406304A (pt) 1995-12-26
DK0699112T3 (da) 1997-09-01
JP2837275B2 (ja) 1998-12-14
FR2705259A1 (fr) 1994-11-25
CN1123529A (zh) 1996-05-29
TNSN94047A1 (fr) 1995-04-25
DE69401814D1 (de) 1997-04-03
MA23195A1 (fr) 1994-12-31
ES2101535T3 (es) 1997-07-01
CN1061277C (zh) 2001-01-31
HUT75913A (en) 1997-05-28
FR2705259B1 (fr) 1995-07-07
FI955549A0 (fi) 1995-11-17
GR3022812T3 (en) 1997-06-30
PL311694A1 (en) 1996-03-04
AU6799794A (en) 1994-12-12
BG100162A (bg) 1996-07-31
FI955549A (fi) 1995-11-17
AU683263B2 (en) 1997-11-06
ZA943423B (de) 1995-02-09
ATE149107T1 (de) 1997-03-15
EG20391A (fr) 1999-02-28
RU2111830C1 (ru) 1998-05-27
HRP940309A2 (en) 1996-08-31
US5732763A (en) 1998-03-31
CZ303695A3 (en) 1996-07-17
WO1994026444A1 (fr) 1994-11-24
HU9503289D0 (en) 1996-01-29
CA2163214A1 (en) 1994-11-24
DE69401814T2 (de) 1997-06-12
YU28294A (sh) 1996-10-18

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