(19)

(11)

EP 0 491 774 A1

(12)

(43) Date of publication: 01.07.1992 Bulletin 1992/27 (21) Application number: 90913525.0 (22) Date of filing: 11.09.1990

(51) International Patent Classification (IPC):  B21D 28/ 12( . ) (86) International application number: PCT/GB1990/001403 (87) International publication number: WO 1991/003336 (21.03.1991 Gazette 1991/07)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 11.09.1989 GB 19890020459 23.01.1990 GB 19900001575 (71) Applicant: SHAPE MACHINES LIMITED Bucks SL7 1CB (GB)	(72) Inventors: MILLS, Peter Marlow, Bucks SL7 1CB (GB) POTEMKIN, Boris Tilehurst, Reading, Berks. RG3 6DE (GB) (74) Representative: Maggs, Michael Norman, et al  Kilburn & Strode 30 John Street London WC1N 2DD London WC1N 2DD (GB)