EP0847821A1 - Réservoir d'alimentation destiné à retenir un métal fondu et notamment un acier - Google Patents
Réservoir d'alimentation destiné à retenir un métal fondu et notamment un acier Download PDFInfo
- Publication number
- EP0847821A1 EP0847821A1 EP97402668A EP97402668A EP0847821A1 EP 0847821 A1 EP0847821 A1 EP 0847821A1 EP 97402668 A EP97402668 A EP 97402668A EP 97402668 A EP97402668 A EP 97402668A EP 0847821 A1 EP0847821 A1 EP 0847821A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tank
- refractory
- cavity
- molten metal
- jet
- 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.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/003—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with impact pads
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
Definitions
- the invention relates to a supply tank for retaining a molten metal and in particular a steel, tank comprising a bottom refractory, refractory partitions, at least one formed nozzle in the refractory bottom to evacuate the molten metal from the tank, a refractory pad comprising a cavity, placed on the bottom of the tank and intended to receive a jet of molten metal from a pocket moved above said tank.
- the supply tank constitutes the transfer reactor between the ladle and the casting mold.
- the improvement in the operation of the supply tank is achieved by the use of cladding such as for example, an impact slab placed at the bottom of the tank, directly above a jet protective tube located under the ladle.
- This impact slab is also called "buffer”.
- the primary function of the tampon is generally to reduce the turbulence of the liquid metal jet coming from the ladle and entering in the tank, by the degradation of the energy of the liquid metal jet falling vertically onto said impact slab.
- the buffer can limit short circuits, this is to say the durations at the end of which the first fluid stream of steel leaves the tank and / or increase the residence times, i.e. the durations of presence of fluid steel nets in the tank.
- the object of the invention is to provide a specific degradation zone energy of the incoming liquid metal jet and simultaneously ensure a refractory reserve in the buffer in order to compensate for its wear under the violent impact of the flow of liquid metal entering the tank.
- the object of the invention is a supply tank intended for retain a molten metal and in particular a steel, tank comprising a refractory pad comprising a cavity, the pad placed on the bottom of the tank and intended to receive a jet of molten metal from a pocket moved above said tank, characterized in that that the tampon cavity is formed of a tampon bottom and a wall substantially vertical, the surface of the buffer base defining a convex volume.
- Figure 1 is a diagram showing a sequence of downstream production of steel.
- Figure 2 is a sectional representation of an example of production of a refractory pad according to the invention.
- Figure 3 is a sectional representation of another example for producing a refractory pad according to the invention.
- Figure 4 is a sectional representation of another example for producing a refractory pad according to the invention.
- Figure 5 is a sectional representation of another example for producing a refractory pad according to the invention.
- a ladle 1 for casting supplies a reservoir supply 2, also called distributor or distributor, the supply tank 2 discharging the liquid metal 3 into a ingot mold 4 for continuous casting.
- the metal supply tank 2 includes a bottom refractory 5, refractory partitions 6 intended to retain the metal melted in the feed tank 2, at least one nozzle 7 formed in the refractory bottom 5 which evacuates by flow, the metal molten tank 2.
- a refractory pad 8 comprising a cavity 9, is placed on the bottom of the tank 2. It is intended to receive a jet 10 of molten metal from the pocket 1 moved above the tank 2.
- the cavity 9 of the pad 8 is formed by a pad bottom 11 and a wall 12 substantially vertical.
- the surface of the buffer base 11 defines a convex volume, that is to say that any segment that joins any two points on the surface delimiting the volume is contained in this volume.
- the buffer base 11 in its convex shape, generates, with the wall 12 substantially vertical lateral of the cavity 9, an angle of strong degradation of the energy of the jet of liquid steel entering the cavity 9 of buffer 8.
- the acute angle generated by the shape of the buffer base 11 and the wall 12 substantially vertical of the cavity 9 is a degradation zone energy of the incoming liquid metal jet and promotes its ascent along from said wall 12 to the metal surface and the slag layer contained in the supply tank, the metal escaping from the buffer essentially by the upper opening thereof.
- the wall 12 has a function of blocking the metal which, associated with the closing effect of the buffer base 11, calms efficiently the energy of the jet.
- the energy attenuation effect is shown in the figures by a spiral arrow.
- Another advantage of the invention is linked to the fact that the bottom constitutes a relatively large reserve of refractory, a reserve which alleviates wear following the violent impact of the jet of molten steel entering, especially when opening pocket 1.
- the pad 8 is a refractory concrete piece, which can be monobloc, fixed on the bottom 5 of the tank and placed directly above the tube for protecting the jet 10 from the ladle 1.
- the stamp can have any geometric shape. He's from preferably parallelepiped or cylindrical.
- the stamp is made of preferably by molding.
- the substantially vertical walls include a skin which ensures easy release of the tampon.
- the wall 12 is relatively high compared to the dimensions of the melts to allow the accumulation of metal from the pocket, the degradation of its energy, and the rise of said metal along from wall 12 to the slag.
- the wall 12 prevents metal nets liquids go directly towards the tap holes. In addition, the wall makes it possible to extend the residence time of the metal in the tank feed.
- the bottom 11 of the cavity 9a of preferably, when the buffer is rectangular, the shape of a pyramid, associated with four substantially flat side walls and vertical.
- the buffer generates between the bottom and the walls, four zones of strong energy degradation of the liquid steel jet entering.
- the bottom 11 of the cavity 9 preferably has when the pad is cylindrical, the shape of a cone, associated with a side wall substantially cylindrical and vertical.
- the stamp generates between the bottom and the wall, a strong crown of degradation energy of the incoming liquid steel jet.
- the bottom surface defines a vertex which can be placed either in the vertical axis of the jet, or slightly moved relative to the axis of the jet. Moving the tampon can generate a rotary movement of the steel flow, the rotary movement participating in the degradation of the energy of the incoming steel jet.
- the bottom surface defines a vertex whose height remains much less than the height of wall 12.
- the pad 8 comprises, drilled in the wall 12, at least one hole drain 16 ensuring on the one hand, a flow of steel in the bottom 5 of the tank, in particular, before the filling steel overflows the tampon, and on the other hand, emptying of the cavity 9 of said tampon in end of casting.
- the internal wall 12 of the cavity 9 comprises at least one peripheral bead 13 located in a substantially horizontal plane and closing all or part of the cavity.
- the bead 13 can be arranged on the surface of wall 12 at a any height relative to the buffer base 11, for example at mid height of the wall 12, thus separating the cavity into two parts.
- the space of the cavity locally reduced, for example, at the outlet of the cavity brings back, after the impact of the jet, the steel flow towards the axis of the jet steel which accentuates the energy degradation effect.
- the peripheral bead 13 comprises at least one part folded back 14 towards the buffer base 11.
- the flow is folded down towards the bottom of the cavity to accentuate the degradation of energy.
- the internal wall of the cavity comprises a series of peripheral beads 15 located in a substantially horizontal plane, defining a corrugated inner wall. Ripples reduce, with the inclination of the convex bottom, the sharp degradation angle of the energy of the liquid steel flow as well when the metal builds up in the bottom of the pad only when it rises on the wall, after the impact of the molten steel jet on the bottom 11.
- said beads can be produced in the form of independent pieces, as for example crowns fitting on the wall 12. Indeed molding into a block of parts comprising a closed space generating for example undercuts is difficult to achieve.
- the proposed reservoir provided with the buffer according to the invention optimizes the reduction of the turbulence of the liquid steel in the impact zone of the reservoir through the creation of areas of high energy degradation. he also optimizes short circuit times and residence times, which which improves the cleanliness of the steel produced.
- the tampon according to the invention promotes flow. piston and reduces the transition time, i.e. the time required to switch from casting a shade A to casting a shade B, or again, the time during which the tank contains the end of the pouring of grade A and the start of casting of grade B.
- Such a pad easy to make, can be inserted alone in the tank, which eliminates the use of skins annexes such as dams, weirs.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
- de transférer l'acier liquide de la poche de coulée vers la lingotière de coulée,
- de répartir l'acier liquide sur les différentes lignes de coulée,
- d'amener l'acier fondu à l'état non turbulent dans la lingotière,
- de réaliser des coulées en séquence,
- d'éliminer dans certaines conditions, les plus grosses inclusions contenues dans l'acier liquide par le biais, par exemple, d'habillages, de rampes de bullage.
- la surface du fond de tampon définit un volume convexe comportant un sommet situé sensiblement dans l'axe du jet de métal fondu ;
- la surface du fond de tampon définit une pyramide ;
- la surface du fond de tampon définit un cône ;
- le tampon comporte au moins un trou de vidange ;
- la paroi interne de la cavité comporte au moins un bourrelet périphérique situé dans un plan sensiblement horizontal ;
- le bourrelet périphérique comporte au moins une partie rabattue vers le fond de tampon ;
- la paroi interne de la cavité comporte une série de bourrelets périphériques situés dans un plan sensiblement horizontal et définissant une paroi interne ondulée.
Claims (8)
- Réservoir d'alimentation destiné à retenir un métal fondu et notamment un acier, réservoir comprenant un fond réfractaire, des cloisons réfractaires, au moins une busette, ménagée dans le fond réfractaire pour évacuer par écoulement le métal fondu du réservoir, un tampon réfractaire, comportant une cavité, placé sur le fond du réservoir et destiné à recevoir un jet de métal fondu en provenance d'une poche déplacée au-dessus dudit réservoir, caractérisé en ce que la cavité du tampon est formée d'un fond de tampon et d'une paroi sensiblement verticale, la surface du fond de tampon définissant un volume convexe.
- Réservoir selon la revendication 1, caractérisé en ce que la surface du fond de tampon définit un volume convexe comportant un sommet situé sensiblement dans l'axe du jet de métal fondu.
- Réservoir selon les revendications 1 et 2, caractérisé en ce que la surface du fond de tampon définit une pyramide.
- Réservoir selon les revendications 1 à 3, caractérisé en ce que la surface du fond de tampon définit un cône.
- Réservoir selon les revendications 1 à 4, caractérisé en ce que le tampon comporte au moins un trou de vidange.
- Réservoir selon les revendications 1 à 5, caractérisé en ce que la paroi interne de la cavité comporte au moins un bourrelet périphérique situé dans un plan sensiblement horizontal.
- Réservoir selon la revendication 6, caractérisé en ce que le bourrelet périphérique comporte au moins une partie rabattue vers le fond de tampon.
- Réservoir selon les revendications 1 à 6, caractérisé en ce que la paroi interne de la cavité comporte une série de bourrelets périphériques situés dans un plan sensiblement horizontal et définissant une paroi interne ondulée.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9615194 | 1996-12-11 | ||
FR9615194A FR2756762B1 (fr) | 1996-12-11 | 1996-12-11 | Reservoir d'alimentation destine a retenir un metal fondu et notamment un acier |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0847821A1 true EP0847821A1 (fr) | 1998-06-17 |
Family
ID=9498535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97402668A Withdrawn EP0847821A1 (fr) | 1996-12-11 | 1997-11-07 | Réservoir d'alimentation destiné à retenir un métal fondu et notamment un acier |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0847821A1 (fr) |
JP (1) | JPH10175046A (fr) |
KR (1) | KR19980064013A (fr) |
CN (1) | CN1067610C (fr) |
AU (1) | AU4541197A (fr) |
BR (1) | BR9705611A (fr) |
CA (1) | CA2217434A1 (fr) |
FR (1) | FR2756762B1 (fr) |
ID (1) | ID18867A (fr) |
TW (1) | TW429179B (fr) |
ZA (1) | ZA9710810B (fr) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000074879A1 (fr) * | 1999-06-08 | 2000-12-14 | Foseco International Limited | Support d'impact pour panier de coulee |
EP1232814A1 (fr) * | 2001-02-14 | 2002-08-21 | Refractaria, S.A. | Dalle d'impact pour la coulée continue |
WO2002094480A1 (fr) * | 2001-05-22 | 2002-11-28 | Vesuvius Crucible Company | Repartiteur par impact pour diviser et distribuer un ecoulement metallique |
EP1591177A1 (fr) * | 1999-08-05 | 2005-11-02 | Pyrotek Engineering Materials Limited | Répartiteur |
EP2769785A1 (fr) * | 2013-02-25 | 2014-08-27 | Refractory Intellectual Property GmbH & Co. KG | Tampon d'impact réfractaire |
CZ305325B6 (cs) * | 2001-05-22 | 2015-08-05 | Vesuvius Crucible Company | Nárazová vložka mezipánve pro kontinuální lití |
US20150273579A1 (en) * | 2014-03-28 | 2015-10-01 | Arcelormittal Investigacion Y Desarrollo, S.L. | Impact pad, tundish and apparatus including the impact pad, and method of using same |
CN107073574A (zh) * | 2014-08-15 | 2017-08-18 | 安赛乐米塔尔研究与发展有限责任公司 | 冲击垫、包括冲击垫的浇注盘和设备、及其使用方法 |
WO2018031549A1 (fr) * | 2016-08-08 | 2018-02-15 | Vesuvius Crucible Company | Plaque d'amortissement |
CN114288921A (zh) * | 2022-01-11 | 2022-04-08 | 北京科技大学 | 一种高温合金铸造用搅拌装置 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20000040975A (ko) * | 1998-12-21 | 2000-07-15 | 이구택 | 연속주조기의 턴디쉬 용강유동 제어장치 |
KR100949681B1 (ko) | 2002-12-23 | 2010-03-30 | 주식회사 포스코 | 턴디쉬용 완충패드 |
KR101340569B1 (ko) * | 2012-02-27 | 2013-12-11 | (주)에스엔엔씨 | 스프레이 헤드 및 이를 이용한 샷 메이킹 주조탱크 |
CN107949446B (zh) * | 2015-08-17 | 2020-03-17 | 日铁日新制钢株式会社 | 环形堰 |
BR112019010696B1 (pt) | 2016-12-16 | 2023-03-28 | Nippon Steel Corporation | Forno elétrico |
EP3557171A4 (fr) | 2016-12-16 | 2020-05-06 | Nippon Steel Corporation | Four électrique |
CN112122602A (zh) * | 2020-06-13 | 2020-12-25 | 泰州市旺鑫耐火材料有限公司 | 一种长寿命中间包稳流器 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1126922A (en) * | 1964-07-01 | 1968-09-11 | Henri Jean Daussan | Improvements in or relating to a method and a device intended for the improvement of the contexture of cast metals |
DE2224482A1 (de) * | 1972-05-19 | 1973-12-06 | Kloeckner Werke Ag | Vorrichtung zum abgiessen aluminiumberuhigter staehle im strang |
EP0184634A1 (fr) * | 1984-11-28 | 1986-06-18 | Lichtenberg Feuerfest Gmbh | Poche pour recevoir et, le cas échéant, post-traiter et/ou transporter du métal liquide chaud |
EP0186852A2 (fr) * | 1984-12-18 | 1986-07-09 | Nippon Steel Corporation | Pannier de coulée pour la coulée continue d'acier de décolletage |
US4715586A (en) * | 1987-02-18 | 1987-12-29 | Bethlehem Steel Corporation | Continuous caster tundish having wall dams |
US4776570A (en) * | 1987-07-08 | 1988-10-11 | Sidbec Dosco Inc. | Ladle stream breaker |
-
1996
- 1996-12-11 FR FR9615194A patent/FR2756762B1/fr not_active Expired - Fee Related
-
1997
- 1997-11-07 EP EP97402668A patent/EP0847821A1/fr not_active Withdrawn
- 1997-11-17 CA CA002217434A patent/CA2217434A1/fr not_active Abandoned
- 1997-11-26 AU AU45411/97A patent/AU4541197A/en not_active Abandoned
- 1997-12-02 ZA ZA9710810A patent/ZA9710810B/xx unknown
- 1997-12-08 ID IDP973844A patent/ID18867A/id unknown
- 1997-12-10 BR BR9705611A patent/BR9705611A/pt not_active Application Discontinuation
- 1997-12-10 KR KR1019970067597A patent/KR19980064013A/ko not_active Application Discontinuation
- 1997-12-10 CN CN97125370A patent/CN1067610C/zh not_active Expired - Fee Related
- 1997-12-11 JP JP9362221A patent/JPH10175046A/ja not_active Withdrawn
- 1997-12-12 TW TW086118744A patent/TW429179B/zh not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1126922A (en) * | 1964-07-01 | 1968-09-11 | Henri Jean Daussan | Improvements in or relating to a method and a device intended for the improvement of the contexture of cast metals |
DE2224482A1 (de) * | 1972-05-19 | 1973-12-06 | Kloeckner Werke Ag | Vorrichtung zum abgiessen aluminiumberuhigter staehle im strang |
EP0184634A1 (fr) * | 1984-11-28 | 1986-06-18 | Lichtenberg Feuerfest Gmbh | Poche pour recevoir et, le cas échéant, post-traiter et/ou transporter du métal liquide chaud |
EP0186852A2 (fr) * | 1984-12-18 | 1986-07-09 | Nippon Steel Corporation | Pannier de coulée pour la coulée continue d'acier de décolletage |
US4715586A (en) * | 1987-02-18 | 1987-12-29 | Bethlehem Steel Corporation | Continuous caster tundish having wall dams |
US4776570A (en) * | 1987-07-08 | 1988-10-11 | Sidbec Dosco Inc. | Ladle stream breaker |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ299614B6 (cs) * | 1999-06-08 | 2008-09-24 | Foseco International Limited | Nárazová podložka pro mezipánev, a mezipánev |
WO2000074879A1 (fr) * | 1999-06-08 | 2000-12-14 | Foseco International Limited | Support d'impact pour panier de coulee |
US7131482B2 (en) | 1999-08-05 | 2006-11-07 | Pyrotek Engineering Materials Limited | Distributor device for use in metal casting |
EP1591177A1 (fr) * | 1999-08-05 | 2005-11-02 | Pyrotek Engineering Materials Limited | Répartiteur |
EP1232814A1 (fr) * | 2001-02-14 | 2002-08-21 | Refractaria, S.A. | Dalle d'impact pour la coulée continue |
US7004227B2 (en) | 2001-05-22 | 2006-02-28 | Vesuvius Crucible Company | Impact pad for dividing and distributing liquid metal flow |
AU2002310036B2 (en) * | 2001-05-22 | 2006-08-10 | Vesuvius Usa Corporation | Impact pad for dividing and distributing liquid metal flow |
KR100858684B1 (ko) * | 2001-05-22 | 2008-09-17 | 비수비우스 크루서블 컴패니 | 용금류의 분할 및 분포를 위한 충돌 패드 |
WO2002094480A1 (fr) * | 2001-05-22 | 2002-11-28 | Vesuvius Crucible Company | Repartiteur par impact pour diviser et distribuer un ecoulement metallique |
CZ305325B6 (cs) * | 2001-05-22 | 2015-08-05 | Vesuvius Crucible Company | Nárazová vložka mezipánve pro kontinuální lití |
US9815112B2 (en) | 2013-02-25 | 2017-11-14 | Refractory Intellectual Property Gmbh & Co. Kg | Refractory impact pad |
EP2769785A1 (fr) * | 2013-02-25 | 2014-08-27 | Refractory Intellectual Property GmbH & Co. KG | Tampon d'impact réfractaire |
WO2014128013A1 (fr) * | 2013-02-25 | 2014-08-28 | Refractory Intellectual Property Gmbh & Co. Kg | Plaque d'amortissement réfractaire |
EA028440B1 (ru) * | 2013-02-25 | 2017-11-30 | Рифрэктори Интеллектчуал Проперти Гмбх Унд Ко. Кг | Футеровочный отбойный предохранительный стакан |
AU2014220873B2 (en) * | 2013-02-25 | 2016-01-21 | Refractory Intellectual Property Gmbh & Co. Kg | Refractory impact pad |
US9308581B2 (en) * | 2014-03-28 | 2016-04-12 | ArceloMittal Investigacion y Desarrollo, S.L. | Impact pad, tundish and apparatus including the impact pad, and method of using same |
US9643248B2 (en) | 2014-03-28 | 2017-05-09 | Arcelormittal Investigacion Y Desarrollo, S.L. | Impact pad, tundish and apparatus including the impact pad, and method of using same |
US20150273579A1 (en) * | 2014-03-28 | 2015-10-01 | Arcelormittal Investigacion Y Desarrollo, S.L. | Impact pad, tundish and apparatus including the impact pad, and method of using same |
CN107073574A (zh) * | 2014-08-15 | 2017-08-18 | 安赛乐米塔尔研究与发展有限责任公司 | 冲击垫、包括冲击垫的浇注盘和设备、及其使用方法 |
CN107073574B (zh) * | 2014-08-15 | 2020-06-26 | 安赛乐米塔尔研究与发展有限责任公司 | 冲击垫、包括冲击垫的浇注盘和设备、及其使用方法 |
WO2018031549A1 (fr) * | 2016-08-08 | 2018-02-15 | Vesuvius Crucible Company | Plaque d'amortissement |
US20190275584A1 (en) * | 2016-08-08 | 2019-09-12 | Vesuvius Usa Corporation | Impact pad |
EP3496882A4 (fr) * | 2016-08-08 | 2020-04-01 | Vesuvius USA Corporation | Plaque d'amortissement |
US10882107B2 (en) | 2016-08-08 | 2021-01-05 | Vesuvius Usa Corporation | Impact pad |
EA037619B1 (ru) * | 2016-08-08 | 2021-04-22 | ВЕЗУВИУС ЮЭсЭй КОРПОРЕЙШН | Ударная подушка |
TWI739877B (zh) * | 2016-08-08 | 2021-09-21 | 美商維蘇威美國公司 | 衝擊墊及減少進入耐火容器的熔融鋼衝擊流之不對準的影響之方法 |
AU2017308821B2 (en) * | 2016-08-08 | 2022-05-12 | Vesuvius Usa Corporation | Impact pad |
CN114288921A (zh) * | 2022-01-11 | 2022-04-08 | 北京科技大学 | 一种高温合金铸造用搅拌装置 |
Also Published As
Publication number | Publication date |
---|---|
ID18867A (id) | 1998-05-14 |
MX9709533A (es) | 1998-12-31 |
CN1190039A (zh) | 1998-08-12 |
KR19980064013A (ko) | 1998-10-07 |
JPH10175046A (ja) | 1998-06-30 |
AU4541197A (en) | 1998-06-18 |
CA2217434A1 (fr) | 1998-06-11 |
BR9705611A (pt) | 1999-03-09 |
TW429179B (en) | 2001-04-11 |
ZA9710810B (en) | 1998-06-12 |
FR2756762B1 (fr) | 1998-12-31 |
CN1067610C (zh) | 2001-06-27 |
FR2756762A1 (fr) | 1998-06-12 |
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