(19)

(11)

EP 0 270 527 A1

(12)

(43) Date of publication: 15.06.1988 Bulletin 1988/24 (21) Application number: 86903516.0 (22) Date of filing: 09.06.1986

(51) International Patent Classification (IPC):  F42B 12/ 06( . ) (86) International application number: PCT/GB1986/000329 (87) International publication number: WO 1987/007708 (17.12.1987 Gazette 1987/28)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI NL SE (71) Applicant: Royal Ordnance plc London WC2N 5BB (GB)	(72) Inventor: FLATAU, Abraham Joppa, MD 21085 (US) (74) Representative: McCormack, Derek James  Royal Ordnance plc 11 The Strand Patents and Licensing Department 2nd Floor London WC2N 5JT London WC2N 5JT (GB)