(19)

(11)

EP 0 293 378 A1

(12)

(43) Date of publication: 07.12.1988 Bulletin 1988/49 (21) Application number: 87901101.0 (22) Date of filing: 11.02.1987

(51) International Patent Classification (IPC):  G01R 33/ 032( . ) (86) International application number: PCT/GB1987/000101 (87) International publication number: WO 1987/004798 (13.08.1987 Gazette 1987/18)

(84) Designated Contracting States: BE DE FR GB NL (30) Priority: 11.02.1986 GB 19860003375 (71) Applicant: Kent Scientific and Industrial Projects Limited Canterbury, Kent CT2 7NR (GB)	(72) Inventors: JACKSON, David, Alfred Kent CT2 7LS (GB) AKHAVAN LEILABADY, Pedram Canterbury Kent CT2 7NR (GB) JONES, Julian, David, Clayton Sittingbourne Kent (GB) (74) Representative: Warren, Keith Stanley, et al  BARON & WARREN 18 South End Kensington London W8 5BU London W8 5BU (GB)