(19)

(11)

EP 0 812 242 A1

(12)

(43) Date of publication: 17.12.1997 Bulletin 1997/51 (21) Application number: 96904210.0 (22) Date of filing: 01.03.1996

(51) International Patent Classification (IPC):  B21D 28/ 28( . ) (86) International application number: PCT/GB1996/000470 (87) International publication number: WO 1996/026798 (06.09.1996 Gazette 1996/40)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 01.03.1995 GB 19950004137 (71) Applicant: Punchmaster Limited Newburn, Newcastle upon Tyne NE15 8NR (GB)	(72) Inventors: LENAHAN, Edward Newcastle Upon Tyne NE15 8NR (GB) YARE, Leslie, John Newcastle Upon Tyne NE15 8NR (GB) (74) Representative: Sanderson, Michael John, et al  MEWBURN ELLIS York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)