(19)

(11)

EP 0 612 275 A1

(12)

(43) Date of publication: 31.08.1994 Bulletin 1994/35 (21) Application number: 92923501.0 (22) Date of filing: 12.11.1992

(51) International Patent Classification (IPC):  B21D 28/ 16( . ) B23P 9/ 02( . ) B21D 28/ 24( . ) (86) International application number: PCT/AU1992/000614 (87) International publication number: WO 1993/009890 (27.05.1993 Gazette 1993/13)

(84) Designated Contracting States: AT CH DE ES FR GB IT LI NL SE (30) Priority: 12.11.1991 AU 19910009455 14.09.1992 AU 19920004703 (71) Applicant: THE COMMONWEALTH OF AUSTRALIA Canberra, ACT 2600 (AU)	(72) Inventors: WONG, Albert, Koon-Siu East Kew, VIC 3102 (AU) RAJIC, Nikolas Greensborough, VIC 3088 (AU) (74) Representative: Newby, John Ross  J.Y. & G.W. Johnson Furnival House 14/18 High Holborn London WC1V 6DE London WC1V 6DE (GB)