(19)

(11)

EP 0 514 448 A1

(12)

(43) Date of publication: 25.11.1992 Bulletin 1992/48 (21) Application number: 91904058.0 (22) Date of filing: 06.02.1991

(51) International Patent Classification (IPC):  H05B 6/ 10( . ) H05B 6/ 02( . ) H05B 6/ 36( . ) C21D 9/ 60( . ) H05B 6/ 08( . ) (86) International application number: PCT/GB1991/000189 (87) International publication number: WO 1991/012702 (22.08.1991 Gazette 1991/19)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 09.02.1990 GB 19900002947 (71) Applicant: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and London SW1A 2HB (GB)	(72) Inventors: HOCKING, Michael Gwyn Surrey GU1 2LX (GB) SIDKY, Paulette Shafik Guildford, Surrey GU1 1SX (GB) (74) Representative: Beckham, Robert William, et al  Defence Research Agency Intellectual Property Department DRA Farnborough Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)