(19)

(11)

EP 0 258 269 A1

(12)

(43) Date of publication: 09.03.1988 Bulletin 1988/10 (21) Application number: 87900243.0 (22) Date of filing: 30.12.1986

(51) International Patent Classification (IPC):  B64F 1/ 20( . ) E01F 9/ 06( . ) F21V 8/ 00( . ) G09F 9/ 305( . ) E01F 9/ 00( . ) E01F 9/ 08( . ) G02B 6/ 42( . ) G09F 13/ 04( . ) (86) International application number: PCT/GB1986/000806 (87) International publication number: WO 1987/004230 (16.07.1987 Gazette 1987/15)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 13.01.1986 GB 19860000706 (71) Applicant: The Secretary of State for Transport in Her Britannic Majesty's Government of the United Kingdom of Great Britain London SW1P 3EP (GB)	(72) Inventors: ARMOUR, John, Sinclair Hampshire GU14 8SD (GB) WATSON, Peter, Michael, Frederick Hampshire RG27 8HQ (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)