IT1224318B - Processo ed impianto per la produzione continua di nastro di acciaio - Google Patents

Processo ed impianto per la produzione continua di nastro di acciaio

Info

Publication number
IT1224318B
IT1224318B IT20752/88A IT2075288A IT1224318B IT 1224318 B IT1224318 B IT 1224318B IT 20752/88 A IT20752/88 A IT 20752/88A IT 2075288 A IT2075288 A IT 2075288A IT 1224318 B IT1224318 B IT 1224318B
Authority
IT
Italy
Prior art keywords
plant
continuous production
steel belt
belt
steel
Prior art date
Application number
IT20752/88A
Other languages
English (en)
Other versions
IT8820752A0 (it
Inventor
Giovanni Arvedi
Klaus Brucker
Peter Meyer
Ernst Windhaus
Fritz-Peter Pleschiutschnigg
Werner Ramfeld
Giovanni Gosio
Ulrich Siegers
Original Assignee
Mannesmann Ag
Giovanni Arvedi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27198581&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=IT1224318(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mannesmann Ag, Giovanni Arvedi filed Critical Mannesmann Ag
Priority to IT20752/88A priority Critical patent/IT1224318B/it
Publication of IT8820752A0 publication Critical patent/IT8820752A0/it
Priority to DE3840812A priority patent/DE3840812A1/de
Priority to ZW6589A priority patent/ZW6589A1/xx
Priority to ZA893835A priority patent/ZA893835B/xx
Priority to AT89906038T priority patent/ATE83409T1/de
Priority to PCT/DE1989/000332 priority patent/WO1989011363A1/de
Priority to KR1019900700155A priority patent/KR950014488B1/ko
Priority to BR898907450A priority patent/BR8907450A/pt
Priority to RO146356A priority patent/RO108933B1/ro
Priority to HU893625A priority patent/HU213334B/hu
Priority to AU36862/89A priority patent/AU624831B2/en
Priority to EP89906038A priority patent/EP0415987B2/de
Priority to DE8989906038T priority patent/DE58903052D1/de
Priority to JP1505379A priority patent/JP2726919B2/ja
Priority to GR890100342A priority patent/GR1001519B/el
Priority to CA000600612A priority patent/CA1341120C/en
Priority to TR89/0485A priority patent/TR25630A/xx
Priority to FI904757A priority patent/FI92161C/fi
Publication of IT1224318B publication Critical patent/IT1224318B/it
Application granted granted Critical
Priority to NO905088A priority patent/NO176085C/no
Priority to DK279290A priority patent/DK171539B1/da
Priority to BG093307A priority patent/BG51443A3/xx
Priority to SU904831837A priority patent/RU2036030C1/ru
Priority to US08/015,300 priority patent/US5307864A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
IT20752/88A 1988-05-26 1988-05-26 Processo ed impianto per la produzione continua di nastro di acciaio IT1224318B (it)

Priority Applications (23)

Application Number Priority Date Filing Date Title
IT20752/88A IT1224318B (it) 1988-05-26 1988-05-26 Processo ed impianto per la produzione continua di nastro di acciaio
DE3840812A DE3840812A1 (de) 1988-05-26 1988-11-30 Verfahren und anlage zur kontinuierlichen herstellung von stahlband oder stahlblech nach dem stranggussverfahren
ZW6589A ZW6589A1 (en) 1988-05-26 1989-05-19 Process and installation for the continuous production of strip steel or sheet steel according to the coninuous-casting process
ZA893835A ZA893835B (en) 1988-05-26 1989-05-22 Process and installation for the continuous production of strip steel or sheet steel according to the continuous-casting process
PCT/DE1989/000332 WO1989011363A1 (fr) 1988-05-26 1989-05-23 Procede pour produire en continu du feuillard d'acier ou de la tole d'acier a partir de produits plats fabriques selon le procede de coulee continue en arc
EP89906038A EP0415987B2 (de) 1988-05-26 1989-05-23 Verfahren zur kontinuierlichen herstellung von bandstahl oder stahlblech aus nach dem bogenstranggiessverfahren hergestellten flachprodukten
JP1505379A JP2726919B2 (ja) 1988-05-26 1989-05-23 連続鋳造により帯鋼又は板鋼を連続製造する方法及び装置
KR1019900700155A KR950014488B1 (ko) 1988-05-26 1989-05-23 연속 주조 방법에 따라 강제품을 연속으로 제조하는 방법 및 장치
BR898907450A BR8907450A (pt) 1988-05-26 1989-05-23 Processo e instalacao para a producao continua de tiras de aco ou chapas de aco segundo o processo de lingotamento continuo
RO146356A RO108933B1 (ro) 1988-05-26 1989-05-23 Procedeu și instalație pentru fabricarea, în proces continuu, a tablelor și benzilor din oțel, conform tehnologiei de turnare continuă
HU893625A HU213334B (en) 1988-05-26 1989-05-23 Method and apparatus for producing strip steels or steel sheets by continuous casting method
AU36862/89A AU624831B2 (en) 1988-05-26 1989-05-23 Continuous production of steel strip and sheet based on continuous casting
AT89906038T ATE83409T1 (de) 1988-05-26 1989-05-23 Verfahren zur kontinuierlichen herstellung von bandstahl oder stahlblech aus nach dem bogenstranggiessverfahren hergestellten flachprodukten.
DE8989906038T DE58903052D1 (de) 1988-05-26 1989-05-23 Verfahren zur kontinuierlichen herstellung von bandstahl oder stahlblech aus nach dem bogenstranggiessverfahren hergestellten flachprodukten.
GR890100342A GR1001519B (el) 1988-05-26 1989-05-24 Μέ?οδος και συσκευή δια την συνεχή παραγωγήν ταινίας ή φύλλου εκ χάλυβος δια της με?όδου της συνεχούς εξελάσεως.
CA000600612A CA1341120C (en) 1988-05-26 1989-05-25 Process and installation for the continuous production of strip steel or sheet steel according to the continuous-casting process
TR89/0485A TR25630A (tr) 1988-05-26 1989-05-26 CUBUK DÖKüM ISLEMINDEN SONRA SüREKLI OLARAK CELIK BANT VEYA CELIK SAC LEVHA IMALATI ICIN YÖNTEM VE TESIS
FI904757A FI92161C (fi) 1988-05-26 1990-09-27 Menetelmä ja laite teräsnauhan tai teräslevyn jatkuvaksi valmistamiseksi
NO905088A NO176085C (no) 1988-05-26 1990-11-23 Fremgangsmåte og anordning for kontinuerlig fremstilling av stålbånd eller stålplate etter strengstöpemetoden
DK279290A DK171539B1 (da) 1988-05-26 1990-11-23 Fremgangsmåde og anlæg til kontinuerlig fremstilling af båndstål eller stålplade ud fra efter buestrengstøbemetoden fremstillede fladprodukter
BG093307A BG51443A3 (en) 1988-05-26 1990-11-26 Method and installation for continuous steel strip or steel plate making using the continuous casting method
SU904831837A RU2036030C1 (ru) 1988-05-26 1990-11-26 Способ изготовления стальной ленты или листов и установка для его осуществления
US08/015,300 US5307864A (en) 1988-05-26 1993-02-08 Method and system for continuously producing flat steel product by the continuous casting method

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT20752/88A IT1224318B (it) 1988-05-26 1988-05-26 Processo ed impianto per la produzione continua di nastro di acciaio
DE8800629 1988-10-10
DE3840812A DE3840812A1 (de) 1988-05-26 1988-11-30 Verfahren und anlage zur kontinuierlichen herstellung von stahlband oder stahlblech nach dem stranggussverfahren

Publications (2)

Publication Number Publication Date
IT8820752A0 IT8820752A0 (it) 1988-05-26
IT1224318B true IT1224318B (it) 1990-10-04

Family

ID=27198581

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20752/88A IT1224318B (it) 1988-05-26 1988-05-26 Processo ed impianto per la produzione continua di nastro di acciaio

Country Status (11)

Country Link
EP (1) EP0415987B2 (it)
KR (1) KR950014488B1 (it)
AU (1) AU624831B2 (it)
BG (1) BG51443A3 (it)
DE (2) DE3840812A1 (it)
DK (1) DK171539B1 (it)
FI (1) FI92161C (it)
IT (1) IT1224318B (it)
TR (1) TR25630A (it)
WO (1) WO1989011363A1 (it)
ZA (1) ZA893835B (it)

Families Citing this family (51)

* Cited by examiner, † Cited by third party
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IT1229749B (it) * 1989-05-17 1991-09-10 Giovanni Arvedi Forno ad induzione di riscaldo ed omogeneizzazione della temperatura per la laminazione di nastri sottili di acciaio.
IT1244295B (it) * 1990-07-09 1994-07-08 Giovanni Arvedi Processo ed impianto per l'ottenimento di nastri di acciaio avvolti, aventi caratteristiche di laminati a freddo ottenuti direttamente in linea di laminazione a caldo
DE4028542A1 (de) * 1990-09-06 1992-03-12 Mannesmann Ag Vorrichtung zum zwischenerwaermen von warmgewalztem band
NL9100911A (nl) * 1991-03-22 1992-10-16 Hoogovens Groep Bv Inrichting en werkwijze voor het vervaardigen van warmgewalst staal.
WO1992022389A1 (en) * 1991-06-18 1992-12-23 Mannesmann Ag Process and plant for obtaining steel strip coils having cold-rolled characteristics and directly obtained in a hot-rolling line
AT398396B (de) * 1993-02-16 1994-11-25 Voest Alpine Ind Anlagen Verfahren zum herstellen eines bandes, vorstreifens oder einer bramme
IT1262073B (it) * 1993-02-16 1996-06-19 Danieli Off Mecc Lingottiera per colata continua di bramme sottili
DE4402402B4 (de) * 1994-01-27 2004-05-13 Sms Demag Ag Verfahren zur Herstellung von warmgewalztem Stahlband aus stranggegossenem Vormaterial und Anlage zur Durchführung des Verfahrens
IT1267916B1 (it) * 1994-03-31 1997-02-18 Danieli Off Mecc Procedimento per la produzione di nastro partendo da bramme sottili e relativo impianto
WO1995026840A1 (fr) * 1994-04-04 1995-10-12 Nippon Steel Corporation Procede de coulee en continu a double rouleaux et dispositif afferent
TW297788B (it) * 1994-12-15 1997-02-11 Sumitomo Metal Ind
DE59504983D1 (de) 1995-01-16 1999-03-11 Mannesmann Ag Vorrichtung zum Führen von warmgewalztem Band durch einen Induktor
DE19540978A1 (de) * 1995-11-03 1997-05-07 Schloemann Siemag Ag Produktionsanlage zum kontinuierlichen- oder diskontinuierlichen Auswalzen von Warmband
DE19613718C1 (de) * 1996-03-28 1997-10-23 Mannesmann Ag Verfahren und Anlage zur Herstellung von warmgewalztem Stahlband
DE19617856C1 (de) 1996-04-23 1997-04-17 Mannesmann Ag Verfahren zur Herstellung von warmgewalztem Stahlband
DE19645497A1 (de) * 1996-11-05 1998-05-07 Schloemann Siemag Ag Verfahren zum Walzen von Grobblechen
KR100353570B1 (ko) * 1996-12-19 2002-09-19 코루스 스타알 베.뷔. 강 스트립 또는 시이트 제조방법 및 제조장치
DE69722616T2 (de) * 1997-09-11 2004-05-13 Nkk Corp. Verfahren zum Warmwalzen von dünnem Walzband und entsprechende Warmwalzenanlage
US6233994B1 (en) * 1997-11-24 2001-05-22 Morgan Construction Company Apparatus for and method of processing billets in a rolling mill
IT1302582B1 (it) 1998-10-01 2000-09-29 Giovanni Arvedi Processo e relativa linea di produzione per la fabbricazione direttadi pezzi finiti stampati o imbutiti da nastro a caldo ultrasottile
DE10302265A1 (de) 2003-01-22 2004-07-29 Sms Demag Ag Verfahren und Vorrichtung zur Erzeugung von stranggegossenen Stahlbrammen
SI1662011T1 (sl) 2004-11-24 2009-04-30 Giovanni Arvedi Toplo valjani dvofazni jekleni trak, ki ima značilnosti hladno valjanega traku
WO2006106376A1 (en) 2005-04-07 2006-10-12 Giovanni Arvedi Process and system for manufacturing metal strips and sheets without solution of continuity between continuous casting and rolling
DE102006002505A1 (de) 2005-10-31 2007-05-03 Sms Demag Ag Verfahren und Fertigwalzstraße zum Warmwalzen von Eingangsmaterial
AT504782B1 (de) 2005-11-09 2008-08-15 Siemens Vai Metals Tech Gmbh Verfahren zur herstellung eines warmgewalzten stahlbandes und kombinierte giess- und walzanlage zur durchführung des verfahrens
DE102006054932A1 (de) 2005-12-16 2007-09-13 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Gießwalzen
WO2007072516A1 (en) * 2005-12-22 2007-06-28 Giovanni Arvedi Process and related plant for producing steel strips with solution of continuity
DE102006001195A1 (de) * 2006-01-10 2007-07-12 Sms Demag Ag Verfahren zum Gieß-Walzen mit erhöhter Gießgeschwindigkeit und daran anschließendem Warmwalzen von relativ dünnen Metall-,insbesondere Stahlwerkstoff-Strängen,und Gieß-Walz-Einrichtung
US20100252149A1 (en) * 2006-01-26 2010-10-07 Giovanni Arvedi Hot rolled dual phase steel strip having features of a cold rolled strip
DE102007005015A1 (de) 2006-06-26 2008-01-03 Sms Demag Ag Verfahren und Anlage zur Herstellung von Warmband-Walzgut aus Siliziumstahl auf der Basis von Dünnbrammen
KR101271973B1 (ko) * 2006-12-27 2013-06-07 주식회사 포스코 미니밀 공정에서의 단상역 압연방법
DE102008020412A1 (de) 2007-08-24 2009-02-26 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Gießwalzen
RU2438805C1 (ru) * 2007-09-13 2012-01-10 Смс Зимаг Аг Компактная гибкая csp установка для непрерывного производства полос, предназначенная для эксплуатации в непрерывном, полунепрерывном и периодическом режиме
AT506065B1 (de) * 2007-11-22 2009-06-15 Siemens Vai Metals Tech Gmbh Verfahren zum kontinuierlichen austenitischen walzen eines in einem kontinuierlichen giessprozess hergestellten vorbandes und kombinierte giess- und walzanlage zur durchführung des verfahrens
RU2477661C2 (ru) 2008-10-30 2013-03-20 Сименс Акциенгезелльшафт Способ регулирования толщины при выходе раската, который проходит через многоклетьевую линию прокатного стана, разомкнутое и/или замкнутое управляющее устройство и прокатный стан
DE102009018683A1 (de) 2009-04-23 2010-10-28 Sms Siemag Ag Verfahren und Vorrichtung zum Stranggießen einer Bramme
DE102009037278A1 (de) 2009-08-12 2011-02-17 Sms Siemag Ag Vorrichtung und Verfahren zum Herstellen eines dünnen Warmbandes
IT1400002B1 (it) 2010-05-10 2013-05-09 Danieli Off Mecc Procedimento ed impianto per la produzione di prodotti laminati piani
IT1400629B1 (it) * 2010-06-22 2013-06-14 Danieli Off Mecc Procedimento ed impianto di colata e laminazione per realizzare prodotti laminati metallici lunghi
DE102011006357A1 (de) 2010-10-08 2012-04-12 Sms Siemag Ag Walzstraße zum Herstellen eines Metallbandes und Verfahren zur Herstellung einer Walzstraße
EP2441539A1 (de) 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Energie- und ausbringungsoptimiertes Verfahren und Anlage zur Erzeugung von Stahlwarmband
EP2441540A1 (de) 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Verfahren und Anlage zur energieeffizienten Erzeugung von Stahlwarmband
EP2441538A1 (de) 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Stranggießvorrichtung mit dynamischer Strangdickenreduzierung
ITMI20112292A1 (it) 2011-12-16 2013-06-17 Arvedi Steel Engineering S P A Dispositivo di supporto ed oscillazione per lingottiera in impianti di colata continua
ITMI20120760A1 (it) * 2012-05-07 2013-11-08 Arvedi Steel Engineering S P A Impianto e procedimento per la produzione di un nastro d'acciaio laminato a caldo in un'ampia gamma dimensionale
DE102012224531A1 (de) 2012-07-27 2014-01-30 Sms Siemag Ag Verfahren zur Herstellung von kornorientierten Silizium-Stählen
WO2015099307A1 (ko) * 2013-12-26 2015-07-02 주식회사 포스코 연주압연장치 및 방법
DE102014221068A1 (de) 2014-10-16 2016-04-21 Sms Group Gmbh Anlage und Verfahren zur Herstellung von Grobblechen
DE102015223787A1 (de) 2015-10-09 2017-04-13 Sms Group Gmbh Verfahren und Vorrichtung zum Herstellen eines metallischen Bandes durch Endloswalzen
CN113039293A (zh) * 2018-11-14 2021-06-25 日本制铁株式会社 薄板钢板的制造装置及薄板钢板的制造方法
IT202000020434A1 (it) * 2020-08-26 2022-02-26 Danieli Off Mecc Processo e apparato per produrre prodotti siderurgici, in particolare di tipo merchant, in particolare in modalita’ endless

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DE942262C (de) * 1939-01-04 1956-05-03 Fritz Grah Dipl Ing Anlage zum Stranggiessen von Metallstraengen mit nachgeschalteten Walzeinrichtungen
GB1199805A (en) * 1967-04-20 1970-07-22 British Iron Steel Research Continuous Casting
DE1758515A1 (de) * 1968-06-18 1971-01-21 Mannesmann Ag Verfahren zum Herstellen von Elektroblechen mit magnetischer Vorzugsrichtung in Walzrichtung aus einer Eisen/Silizium-Stahllegierung
DE3241745C2 (de) * 1982-11-11 1985-08-08 Mannesmann AG, 4000 Düsseldorf Verfahren zum Herstellen von warmgewalztem Stahlband aus stranggegossenem Vormaterial in unmittelbar aufeinanderfolgenden Arbeitsschritten
DE3870970D1 (de) * 1987-04-13 1992-06-17 Thyssen Stahl Ag Verfahren zum herstellen eines stahlbandes.

Also Published As

Publication number Publication date
DK171539B1 (da) 1996-12-30
DE3840812A1 (de) 1990-04-05
IT8820752A0 (it) 1988-05-26
DK279290D0 (da) 1990-11-23
EP0415987B1 (de) 1992-12-16
AU624831B2 (en) 1992-06-25
TR25630A (tr) 1993-05-03
WO1989011363A1 (fr) 1989-11-30
KR950014488B1 (ko) 1995-12-02
FI92161C (fi) 1994-10-10
FI904757A0 (fi) 1990-09-27
KR900701437A (ko) 1990-12-03
ZA893835B (en) 1990-02-28
EP0415987B2 (de) 1999-11-24
DE58903052D1 (de) 1993-01-28
DK279290A (da) 1990-11-23
FI92161B (fi) 1994-06-30
BG51443A3 (en) 1993-05-14
AU3686289A (en) 1989-12-12
EP0415987A1 (de) 1991-03-13

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