(19)

(11)

EP 0 445 133 A1

(12)

(43) Date of publication: 11.09.1991 Bulletin 1991/37 (21) Application number: 89912004.0 (22) Date of filing: 24.10.1989

(51) International Patent Classification (IPC):  G06F 3/ 06( . ) G06K 19/ 077( . ) G11B 33/ 06( . ) G06F 3/ 00( . ) G11B 23/ 03( . ) (86) International application number: PCT/GB1989/001271 (87) International publication number: WO 1990/004847 (03.05.1990 Gazette 1990/10)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 28.10.1988 US 19880263833 (71) Applicants: GORDON, Alastair Taylor Toronto, Ontario M4P 2N4 (CA) REICHMANN, Michael H. Toronto, Ontario M1N 2R6 (CA)	(72) Inventors: GORDON, Alastair Taylor Toronto, Ontario M4P 2N4 (CA) REICHMANN, Michael H. Toronto, Ontario M1N 2R6 (CA) (74) Representative: Brooks, Nigel Samuel  Hill Hampton East Meon Petersfield Hampshire GU32 1QN Petersfield Hampshire GU32 1QN (GB)