EP0777538B1 - Verfahren und vorrichtung zum setzen von stopfen an stopfenwalzwerken - Google Patents
Verfahren und vorrichtung zum setzen von stopfen an stopfenwalzwerken Download PDFInfo
- Publication number
- EP0777538B1 EP0777538B1 EP95925733A EP95925733A EP0777538B1 EP 0777538 B1 EP0777538 B1 EP 0777538B1 EP 95925733 A EP95925733 A EP 95925733A EP 95925733 A EP95925733 A EP 95925733A EP 0777538 B1 EP0777538 B1 EP 0777538B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mandrel
- rolling line
- waiting position
- plug
- mechanism according
- 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
Links
- 238000000034 method Methods 0.000 title claims description 8
- 238000005096 rolling process Methods 0.000 claims description 56
- 230000007246 mechanism Effects 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 2
- 230000004913 activation Effects 0.000 claims 1
- 239000002826 coolant Substances 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 claims 1
- 230000008859 change Effects 0.000 description 29
- 238000010276 construction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
- B21B25/06—Interchanging mandrels, fixing plugs on mandrel rods or cooling during interchanging mandrels
Definitions
- the invention relates to a method and an apparatus for setting stoppers Plug rolling mills according to the generic term of the main claim.
- the generic device has long been known and there are several Publications about it (DE-OS 1752383, GM 7148215 U1; DE-OS 2700589). All of the steps mentioned are based on the principle of one arranged below the rolling line Cone drum, which is provided with several pockets on the circumference, in which the slide on a slide sliding plug. With some constructions (DE-OS 1752383; GM 7148215 U1) forms the one at the top vertex Pocket the addition of the one in front and behind in the rolling line Guideway. In another construction (DE-OS 2700589) by means of a Pushing the plug out of the pocket of the cone drum onto a trough-like Rail piece pushed, which is then pivoted into the rolling line.
- the object of the invention is a process-optimized method and a to specify space-saving device, even with a large bandwidth different plug dimensions works trouble-free and an effective visual inspection of the surrounding plugs allows.
- the space-saving design is achieved in that for the movement of the Lifting device an approximately elliptical path is chosen, which is in one plane is perpendicular to the rolling line.
- the long axis of the elliptical orbit is roughly parallel to the sliding line of the plug and only slightly offset to the rolling line in the direction Operator side.
- the upper vertex of the orbit is above the edge of the Guide trough.
- This track shape is achieved by a crank mechanism that has three Has co-rotating wheels of the same size and two intermediate wheels, wherein two wheels designed as spur gears articulated via cranks with the Lifting device are connected.
- the Location of the stopper is laterally offset before lifting.
- a pivoted lever is arranged, the trough-shaped lateral extension forms the continuation of the slide.
- This lever is about one Pull-push rod, which on a worm gear ring and a spur gear ring having gear of the crank mechanism is articulated, kinematically connected to the sequence of movements of the lifting device.
- the stopper in the Plane of the rolling line remain, then the fulcrum of the receiving Lever laterally offset from the rolling line so that the Gripper of the lifting device from below the plug can take what would mean corresponding space requirements.
- the upper cover together with the lower plug change lever forms a prism-like support. If, for example, the element is articulated hydraulic cylinder is pivoted, a passage opening is opened, which allows a damaged plug or its fragments to be fixed over a to arrange the arranged slide plate.
- the slide plate is inside of the discharge element and forms an extension to the swung-in lower one Plug change lever
- the formation of the waiting position at the level of the rolling line is a very important advantage and close to it. In this way, the one on this side of the Operator standing on the rolling line in a simple manner the previously recooled Check the stopper visually and when the stopper is transferred to the rolling line provided with lubricant. Alternatively, it is also possible that the lubrication of the Stopper is taken over by the nozzles for cooling the stopper.
- There the waiting and the rolling position are at the same height, can be advantageous a manipulator can be used, the two in circulation when changing dimensions grasp the plug and replace it with two new ones. After filing of the two new plugs, the two plugs that are no longer required are extended and for measuring and possibly revising the working part in the Workshop given.
- the manipulator can also be used to get one at the visual control classified as no longer usable stopper from the Raise the waiting position and drive away.
- the storage of the plug in the rolling line in a fixed Prismatic guide so that it is no longer possible to tilt the stopper.
- the axial alignment of the stopper in relation to the rolling line is one of the essential requirements for trouble-free operation.
- the forms fixed prism guide a continuous continuation of the before and after arranged guideway.
- Figure 1 shows in the form of a schematic diagram a front view lying in the rolling direction a device according to the invention. This line of sight is congruent with the Direction of the helmsman of the stopper rolling mill sitting above the rolling line.
- the essential elements of the plug changing device according to the invention are the upper plug change lever 1, which is designed as a gripper, and which acts as a swivel element trained lower plug change lever 2 and the two plug change lever 1,2 Kinematically linked crank mechanism 3 including a push-push rod 4.
- the crank mechanism 3 consists of three rotating in the same direction large wheels 5,6,7 with two smaller ones arranged in between but also equally large intermediate gears 8,9, the first gear 5 having a ring gear 36 and has a spur gear ring 37, while the other two wheels 6.7 Spur gears are formed.
- the direction of rotation of the three wheels 5,6,7 is indicated by arrows.
- the crank mechanism 3 is driven via a cardan shaft, which is only indicated here 10, with a controllable electric motor, not shown here, via a Safety clutch is connected.
- a worm shaft 11 with a corresponding gear
- the first wheel 5 having two ring gears 36, 37 of the crank mechanism 3 driven.
- One ring gear 36 is a worm wheel
- the second ring gear 37 is a spur gear, both on a common axis are arranged.
- the already mentioned pull-push rod 4 is articulated via a crank 12.
- the other end of the push-pull rod 4 is hinged to the lower one Plug change lever 2 connected.
- the pivotability of this plug change lever 2 is indicated by an arrow 13.
- the second gear 6 of the crank mechanism 3, which is designed as a spur gear, is via a Crank 14 articulated to the upper plug change lever 1, namely indirectly via a sliding block 15.
- This sliding block 15 can be in one corresponding recess 16 of the upper plug change lever 1 back and forth move (see also Fig. 3).
- the third, also designed as a spur gear Wheel 7 of the crank mechanism 3 also has a crank 17 which is articulated with the upper part of the upper plug change lever 1 is connected. So the top one
- the stopper 18 is the gripper arm 18 pivotally connected to the actual support member 38.
- the cushioning for that A spring 19 takes over the pivoting of the gripping arm 18.
- the size of the wheels 5,6,7 of the crank mechanism and the kinematics of the individual Cranks 12, 14, 17 are now coordinated so that the plug receiving trough-shaped free end 20 of the gripping arm 18 approximately describes an elliptical path.
- This path lies exactly in a perpendicular to the Rolling line standing plane and points in contrast to the known cone drum no inclination.
- the major axis 21 (shown here as a dashed line) lies parallel to the slide line (arrow) 22 of the plug and slightly offset in the direction of the Operator side. The upper vertex of this orbit results from the fact that the Plug over the edge 23 of the prism-like guideway 24 must be raised.
- FIG. 4 shows how the pivoting-out of the discharge element 25 a passage opening is formed so that the damaged, for example Plug or its fragments discharged along the fixed slide 30 can be. Details of this are given in the description of this FIG. 4 removable.
- the stopper remains free for as long End 20 of the gripping arm 18 lie until the rolling line is free. Then the moves Gripping arm 18 continues the stopper along the path above the top vertex away and places it in the rolling position 35. So that the free end 20 of Gripping arm 18 can submerge, there are corresponding slots in the guideway 24 40 (see Figure 2) provided.
- this rolling position 35 the stopper is known Way by threading over the cone of the plug from the pipe to be rolled taken and on appropriately trained guideways into the Rolled caliber pushed and brought centering on the mandrel bar. After rolling has been carried out, the previously explained workflow begins anew.
- the housing encompassing the entire device has been here for simplicity omitted, since it is also not essential to the invention.
- FIG 3 shows in the same view as Fig. 1, the phase of the transfer of the plug into the rolling line (rolling position 35) and the gripper arm picks up the stopper 18 in the receiving position 33.
- the lifting of the Is from the waiting position 34 to the upper vertex required because the stopper is lifted over the edge 23 of the guideway 24 must become.
- the plug is placed in the fixed one prism-like guide track 24, which represents an extension of before and after the guideway. So that the free end 20 of Gripping arms can dive through the guide track 24, as already mentioned in the guide track 24 slots 40 are arranged (see Figure 2).
- the gripper of the Gripping arm 18 consists of two upright web plates 42, 42 ', the Parallel distance 43 to match the length of the cylindrical guide portion 44 of the Plug is selected (Fig. 2).
- the upper plug change lever 1 After depositing the plug in the rolling position 35 and submerging the Gripping arm 18, the upper plug change lever 1 by means of the crank 17 and spur gear 7 of the crank mechanism 3 moves on. After passing through the the lower apex (not shown here) the gripping arm 18 reaches the Recording position 33. This is selected so that the gripping arm 18 from below Pick up the stopper securely and without misalignment and move it up to waiting position 34 can lift. The sideways movement of the stopper from the catch position 39 in the Recording position 33 takes place by means of the pivoting movement of the lower one Plug change lever 2, in the phase in which the upper Plug change lever 1 the other plug from the waiting position 34 in the Roll position 35 moves.
- the discharge element 25 consists of two cheeks 47, 47 'arranged in parallel, which are connected at the lower end to a rotary rod 48.
- the top end faces a cover 26, which together with the lower plug change lever 2 prism-like support for the stopper in the receiving position 33 forms. So that Gripping arm 18 of the upper stopper lever 1 when receiving the stopper through the cover 26, there are corresponding slots 41 arranged.
- the distance between the two cheeks 47, 47 'and their height is selected so that the largest stopper used in the stopper rolling mill with no difficulty can be removed.
- FIG 6 is a manipulator in connection with the invention Plug changing device shown.
- the manipulator 50 consists of one here only indicated car, which is movable on rails 51 perpendicular to the rolling line.
- On the manipulator four gripping arms 52 to 55 are arranged, which correspond to the Position shown in dashed lines can be moved up and down.
- At the bottom Gripping arms 52 to 55 have sensors 56 arranged between them Plug can be clamped.
- the same altitude of the invention essential Waiting position 34 and the rolling position 35 allows at Dimensional changes in a very simple manner by means of the manipulator the two to be replaced and lift the stopper 57.58.
- the manipulator can hold the plugs 59.60 in required for the next rolling dimension be moved to the appropriate position and then to the end 20 of the Gripping arms 18 on the one hand and on the guide track 24 on the other hand. Then the two plugs 57, 58 no longer required are moved away and fed to a control and revision station.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manipulator (AREA)
- Metal Rolling (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Load-Engaging Elements For Cranes (AREA)
Description
- Figur 1
- in Form einer Prinzipskizze eine in Walzrichtung liegende Vorderansicht einer erfindungsgemäßen Vorrichtung
- Figur 2
- Stopfen in der Hebevorrichtung kurz vor Ablage in die Führungsrinne
- Figur 3
- wie Fig. 1, jedoch in der Phase der Ablage des einen Stopfens in die Walzposition (oben) und der Aufnahme des anderen Stopfens (unten)
- Figur 4
- wie Fig. 1, jedoch in der speziellen Situation des Ausschleusens eines beschädigten Stopfens
- Figur 5
- eine Ansicht in Richtung Y in Fig. 4.
- Figur 6
- eine Teilansicht eines Manipulators in Verbindung mit der erfindungsgemäßen Vorrichtung.
Claims (10)
- Verfahren zum Setzen von Stopfen an Stopfenwalzwerken, bei dem der Stopfen nach vollendeter Walzung eines Rohres von der Anlage an eine Stopfenstange befreit und aufgrund seines Gewichtes sich aus der Walzlinie nahezu ohne seitlichen Versatz nach unten herausbewegt, mit einem Kühlmittel rückgekühlt und in den Bereich der Walzlinie wieder angehoben wird,
dadurch gekennzeichnet,
daß der Stopfen sich beim Anheben in die Walzlinie (35) in einer senkrecht zur Walzlinie liegenden Ebene auf einer annähernd elliptischen Bahn bewegt und vor dem Ablegen in die Walzlinie eine Warteposition (34) einnimmt, die sich auf etwa gleicher Höhe im seitlichen Abstand zur Walzlinie (35) befindet und vor dem Anheben nach dem Herausbewegen aus der Walzlinie zuerst seitlich in Richtung der Warteposition bewegt und beim Herausbewegen aus der Walzlinie und bei Einnahme der Warteposition rückgekühlt und/oder geschmiert wird, wobei nach dem Herausbewegen des Stopfens aus der Walzlinie (35) und dem Abziehen des gewalzten Rohres von der Warteposition (34) aus die Bewegung einsetzt und ein anderer zuvor rückgekühlter und/oder geschmierter Stopfen in die Walzlinie abgelegt und dabei gleichzeitig der herausbewegte Stopfen seitlich bewegt, dann aufgenommen und in die Warteposition angehoben wird. - Vorrichtung zum Setzen von Stopfen an Stopfenwalzwerken mit einer Rutsche zur Aufnahme des aus der Walzlinie sich nach unten bewegenden Stopfens, mit einer Kühleinrichtung, einer Hebevorrichtung, zur Durchführung des Verfahrens nach Anspruch 1,
dadurch gekennzeichnet,
daß die Hebevorrichtung zwei Stopfenwechselhebel (1,2) aufweist, deren Bewegung über ein Kurbelgetriebe (3) kinematisch miteinander verknüpft ist und der den Stopfen anhebende, einen Greifarm (18) aufweisende obere Stopfenwechselhebel (1) an zwei Stellen und der den Stopfen seitlich schwenkende untere Stopfenwechselhebel (2) mittels einer Zug-Druckstange (4) über Kurbeln (14,17,12) angelenkt mit dem Kurbelgetriebe (3) verbunden sind, wobei Anfang und Ende des Bewegungsablaufes die Warteposition (34) des Greifarmes (18) ist. - Vorrichtung nach Anspruch 2,
dadurch gekennzeichnet,
daß der Greifarm (18) am freien Ende (20) zwei voneinander beabstandete, parallel liegende hochkantstehende Stegbleche (42,42') aufweist, die zur Aufnahme des Stopfens auf der obenliegenden Schmalseite eine muldenartige Kontur aufweisen und alle in der Bewegungsbahn des Greifarms (18) liegende Teile entsprechend breite Schlitze (40,41) zum Durchtritt der Stegbleche (42,42') aufweisen. - Vorrichtung nach Anspruch 2,
dadurch gekennzeichnet,
daß das Kurbelgetriebe (3) drei gleichsinnig sich drehende Räder (5,6,7) mit dafür zwei dazwischen angeordneten Zwischenrädern (8,9) aufweist und das erste mit dem unteren Stopfenwechselhebel (2) über die Kurbel (12) und die Zug-Druckstange (4) zusammenwirkende Rad (5) ein auf einer gemeinsamen Achse angeordneten Stirnradzahnkranz (37) sowie ein Schneckenradzahnkranz (36) aufweist, wobei der letztgenannte ,mit einer das Kurbelgetriebe (3) antreibenden Schneckenwelle (11) im Eingriff ist und das zweite als Zahnstirnrad ausgebildete Rad (6) über einen an der Kurbel (14) angeordneten Kulissenstein (15) und das dritte ebenfalls als Zahnstirnrad ausgebildete Rad (7) auch über die Kurbel (17) am oberen Ende mit dem oberen Stopfenwechselhebel (1) zusammenwirkt. - Vorrichtung nach einem der Ansprüche 2 bis 4,
dadurch gekennzeichnet
daß die obere Abdeckung (26) eines schwenkbaren hohlkastenartigen Ausschleuselementes (25) zusammen mit dem unteren Stopfenwechselhebel (2) eine prismenähnliche Aufnahmeposition (33) des Stopfens für den Greifarm (18) bildet und das Ausschleuselement (25) angelenkt mit einem Betätigungsmittel (27) verbunden ist. - Vorrichtung nach Anspruch 5,
dadurch gekennzeichnet,
daß innerhalb des Ausschleuselementes (25) ein fest angeordnetes Rutschblech (29) sich befindet, das bei entsprechender Schwenklage des Ausschleuselementes (25) eine Verlängerung zum eingeschwenkten unteren Stopfenwechselhebel (2) bildet. - Vorrichtung nach einem der Ansprüche 2 bis 6,
dadurch gekennzeichnet,
daß im Bereich der Rutsche (30) und der Warteposition (34) des Greifarmes (18) mindestens zwei Sprühdüsen zur Rückkühlung und/oder Schmierung des Stopfens angeordnet sind. - Vorrichtung nach Anspruch 7,
dadurch gekennzeichnet,
daß der Strahl der in Warteposition (34) angeordneten Sprühdüsen überwiegend auf den Arbeitsteil des Stopfens gerichtet ist. - Vorrichtung nach einem der Ansprüche 2 bis 7,
dadurch gekennzeichnet,
daß im Bereich der Warteposition (34) ein quer zur Walzlinie verfahrbarer Manipulator (50) angeordnet ist, der mindestens zwei Greifarme (52-55) zur Aufnahme von zwei Stopfen (57,58) aufweist. - Vorrichtung nach Anspruch 9,
dadurch gekennzeichnet,
daß der Manipulator (50) vier Greifarme (57-55) aufweist.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4431389A DE4431389C1 (de) | 1994-08-25 | 1994-08-25 | Verfahren und Vorrichtung zum Setzen von Stopfen an Stopfenwalzwerken |
| DE4431389 | 1994-08-25 | ||
| PCT/DE1995/000982 WO1996005921A1 (de) | 1994-08-25 | 1995-07-21 | Verfahren und vorrichtung zum setzen von stopfen an stopfenwalzwerken |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0777538A1 EP0777538A1 (de) | 1997-06-11 |
| EP0777538B1 true EP0777538B1 (de) | 1999-03-03 |
Family
ID=6527323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95925733A Expired - Lifetime EP0777538B1 (de) | 1994-08-25 | 1995-07-21 | Verfahren und vorrichtung zum setzen von stopfen an stopfenwalzwerken |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5829296A (de) |
| EP (1) | EP0777538B1 (de) |
| CN (1) | CN1062786C (de) |
| DE (2) | DE4431389C1 (de) |
| RO (1) | RO118386B1 (de) |
| WO (1) | WO1996005921A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204719B (zh) * | 2007-12-01 | 2010-06-02 | 太原重工股份有限公司 | 用于拔伸压机的芯棒循环装置 |
| JP4834121B2 (ja) * | 2009-03-17 | 2011-12-14 | Jfeスチール株式会社 | 継目無鋼管用プラグ搬送設備 |
| CN101773933B (zh) * | 2009-12-23 | 2012-07-18 | 太原通泽重工有限公司 | 顶杆芯棒定位装置 |
| CN101716598B (zh) * | 2009-12-24 | 2011-12-28 | 太原通泽重工有限公司 | 一种顶杆循环的大口径钢管生产工艺 |
| CN102310081A (zh) * | 2011-07-23 | 2012-01-11 | 烟台鲁宝钢管有限责任公司 | 一种顶杆装取装置 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7148215U (de) * | 1972-07-20 | Mannesmannroehren Werke Ag | Dornwechselvorrichtung und Dorn an Walzwerken zum Abstrecken von Hohlkörpern | |
| GB281951A (en) * | 1927-03-21 | 1927-12-15 | Schloemann Ag | Device for taking out, cooling and replacing mandrels in pilger mills |
| US1714131A (en) * | 1928-01-11 | 1929-05-21 | Austin G Mchugh | Mandrel changing and cooling machine |
| BE715196A (de) * | 1967-05-18 | 1968-09-30 | ||
| DE1925451A1 (de) * | 1968-05-18 | 1969-12-11 | Innocenti Soc Gen Per L Ind Me | Selbsttaetige Dornwechselvorrichtung fuer Schraegwalzwerk |
| DE2041180C3 (de) * | 1970-01-31 | 1978-11-09 | Friedrich Kocks Gmbh & Co, 4000 Duesseldorf | Vorrichtung zum Fördern von Dornstangen hinter einem Schrägwalzwerk |
| DE2163818A1 (de) * | 1971-12-17 | 1973-06-20 | Mannesmann Roehren Werke Ag | Stopfen fuer rohrwalzwerk |
| CA960885A (en) * | 1972-08-02 | 1975-01-14 | Frederick W. Kruppert | Device for inserting plugs in a plug mill |
| CA1017976A (en) * | 1974-11-30 | 1977-09-27 | Haruo Kamimura | Method and apparatus for supplying plugs to plug mills |
| US4038854A (en) * | 1976-05-04 | 1977-08-02 | Aetna-Standard Engineering Company | Plug changer for plug mill |
| DE2657059C3 (de) * | 1976-12-14 | 1980-10-23 | Mannesmann Ag, 4000 Duesseldorf | Dornwechselvorrichtung für ein Schrägwalzwerk |
| DE3345665C2 (de) * | 1983-12-14 | 1986-11-27 | Mannesmann AG, 4000 Düsseldorf | Vorrichtung zum Halten der Walzstange und zum Führen des Walzgutes |
-
1994
- 1994-08-25 DE DE4431389A patent/DE4431389C1/de not_active Expired - Fee Related
-
1995
- 1995-07-21 RO RO97-00340A patent/RO118386B1/ro unknown
- 1995-07-21 WO PCT/DE1995/000982 patent/WO1996005921A1/de not_active Ceased
- 1995-07-21 CN CN95194778A patent/CN1062786C/zh not_active Expired - Lifetime
- 1995-07-21 DE DE59505217T patent/DE59505217D1/de not_active Expired - Lifetime
- 1995-07-21 EP EP95925733A patent/EP0777538B1/de not_active Expired - Lifetime
-
1996
- 1996-01-19 US US08/793,436 patent/US5829296A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1156422A (zh) | 1997-08-06 |
| WO1996005921A1 (de) | 1996-02-29 |
| RO118386B1 (ro) | 2003-05-30 |
| EP0777538A1 (de) | 1997-06-11 |
| US5829296A (en) | 1998-11-03 |
| DE4431389C1 (de) | 1995-08-10 |
| DE59505217D1 (de) | 1999-04-08 |
| CN1062786C (zh) | 2001-03-07 |
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Legal Events
| Date | Code | Title | Description |
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