(19)

(11)

EP 0 783 384 A1

(12)

(43) Date of publication: 16.07.1997 Bulletin 1997/29 (21) Application number: 94925111.0 (22) Date of filing: 22.07.1994

(51) International Patent Classification (IPC):  B23P 11/ 00( . ) B21D 39/ 03( . ) (86) International application number: PCT/US1994/008413 (87) International publication number: WO 1996/003232 (08.02.1996 Gazette 1996/07)

(84) Designated Contracting States: DE ES FR GB IT (71) Applicant: BTM CORPORATION Marysville, Michigan 48040 (US)	(72) Inventor: Wu, Xinrong Marysville, MI 48040 (US) (74) Representative: Price, Nigel John King  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)