(19)

(11)

EP 0 582 564 A1

(12)

(43) Date of publication: 16.02.1994 Bulletin 1994/07 (21) Application number: 91908574.0 (22) Date of filing: 29.04.1991

(51) International Patent Classification (IPC):  G01R 33/ 035( . ) G01R 33/ 44( . ) G01R 33/ 36( . ) G01R 33/ 46( . ) (86) International application number: PCT/GB1991/000681 (87) International publication number: WO 1992/019978 (12.11.1992 Gazette 1992/28)

(84) Designated Contracting States: BE DE FR GB IT NL (71) Applicant: DATALIGHT LIMITED Hong Kong (HK)	(72) Inventor: JONSEN, Paul 22 Morley Close Yateley Surrey GU17 7TY (GB)