(19)

(11)

EP 0 427 766 A1

(12)

(43) Date of publication: 22.05.1991 Bulletin 1991/21 (21) Application number: 89909008.0 (22) Date of filing: 31.07.1989

(51) International Patent Classification (IPC):  F16F 7/ 01( . ) G10K 11/ 16( . ) (86) International application number: PCT/GB1989/000869 (87) International publication number: WO 1990/001645 (22.02.1990 Gazette 1990/05)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 02.08.1988 GB 19880018331 (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: HOUSE, John, Richard Wimborne Dorset BH21 7JX (GB) HILLIAR, Ann, Elizabeth Branksome Poole BH12 1EA (GB) (74) Representative: Beckham, Robert William  Defence Evaluation and Research Agency Intellectual Property Department R69 Building DERA Farnborough Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)