(19)

(11)

EP 0 412 106 A1

(12)

(43) Date of publication: 13.02.1991 Bulletin 1991/07 (21) Application number: 89905445.0 (22) Date of filing: 25.04.1989

(51) International Patent Classification (IPC):  G01P 5/ 12( . ) G01P 15/ 097( . ) G01P 15/ 12( . ) H01L 29/ 84( . ) G01P 15/ 08( . ) G01P 15/ 10( . ) G01P 15/ 18( . ) (86) International application number: PCT/GB1989/000441 (87) International publication number: WO 1989/010567 (02.11.1989 Gazette 1989/26)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 25.04.1988 GB 19880009755 (71) Applicant: THE SECRETARY OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTY'S GOVERNMENT OF THE UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN London SW1A 2HB (GB)	(72) Inventors: MILES, Dennis, John Hampshire GU13 9PN (GB) SMITH, Sidney, George Aldershot Hampshire GU11 3LZ (GB) (74) Representative: Lockwood, Peter Brian  Procurement Executive Ministry of Defence Patents 1 A (4) Room 2014, Empress State Building Lillie Road London SW6 1TR London SW6 1TR (GB)