(19)

(11)

EP 0 260 295 A1

(12)

(43) Date of publication: 23.03.1988 Bulletin 1988/12 (21) Application number: 87901588.0 (22) Date of filing: 13.03.1987

(51) International Patent Classification (IPC):  F41J 5/ 02( . ) G01S 5/ 16( . ) G01B 11/ 00( . ) (86) International application number: PCT/GB1987/000177 (87) International publication number: WO 1987/005688 (24.09.1987 Gazette 1987/21)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 15.03.1986 GB 19860006429 (71) Applicants: Fenner, David Fenton Great Dunmow Essex CM6 1NF (GB) WEBSTER, Stephen Kingston Upon Thames, Surrey KT2 6HE (GB)	(72) Inventors: Fenner, David Fenton Great Dunmow Essex CM6 1NF (GB) WEBSTER, Stephen Kingston Upon Thames, Surrey KT2 6HE (GB) (74) Representative: Holliday, Frank  MARKS & CLERK, 57-60 Lincoln's Inn Field London WC2A 3LS London WC2A 3LS (GB)