(19)

(11)

EP 0 073 754 A1

(12)

(43) Date of publication: 16.03.1983 Bulletin 1983/11 (21) Application number: 81900803.0 (22) Date of filing: 13.03.1981

(51) International Patent Classification (IPC):  B21D 43/ 02( . ) (86) International application number: PCT/SE1981/000079 (87) International publication number: WO 1982/003201 (30.09.1982 Gazette 1982/23)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (71) Applicant: VENTIVE AB S-183 31 Täby (SE)	(72) Inventors: WALLENIUS, Jan Folke S-183 30 Täby (SE) HELGESSON, Carl Olov S-171 43 Solna (SE)