(19)

(11)

EP 0 470 163 A1

(12)

(43) Date of publication: 12.02.1992 Bulletin 1992/07 (21) Application number: 90907277.0 (22) Date of filing: 30.04.1990

(51) International Patent Classification (IPC):  G06F 1/ 00( . ) G11B 19/ 04( . ) G06F 11/ 32( . ) G06F 21/ 00( . ) G11B 20/ 00( . ) (86) International application number: PCT/GB1990/000666 (87) International publication number: WO 1990/013864 (15.11.1990 Gazette 1990/26)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 28.04.1989 GB 19890009760 05.06.1989 GB 19890012920 06.09.1989 GB 19890020181 15.03.1990 GB 19900005794 (71) Applicant: COWSLEY, Christopher William Hertfordshire SG8 5DE (GB)	(72) Inventor: COWSLEY, Christopher William Hertfordshire SG8 5DE (GB) (74) Representative: Cullis, Roger  Patents Department British Technology Group Ltd 101 Newington Causeway London SE1 6BU London SE1 6BU (GB)