(19)

(11)

EP 0 506 783 A1

(12)

(43) Date of publication: 07.10.1992 Bulletin 1992/41 (21) Application number: 91901605.0 (22) Date of filing: 17.12.1990

(51) International Patent Classification (IPC):  G07F 17/ 30( . ) G11B 27/ 11( . ) G11B 27/ 00( . ) G11B 27/ 34( . ) (86) International application number: PCT/GB1990/001963 (87) International publication number: WO 1991/010217 (11.07.1991 Gazette 1991/15)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 22.12.1989 GB 19890029061 01.06.1990 GB 19900012203 05.12.1990 GB 19900026447 (71) Applicant: YOUR ELECTRONICS SPECIALISTS LIMITED Heckmondwike, West Yorkshire WF16 0NL (GB)	(72) Inventors: HART, Bernard Paul Tinley, W. Yorkshire WF3 1LA (GB) ARBITER, Ivor London NW4 1TG (GB) (74) Representative: Jones, William, et al  William Jones CPA The Crescent 54 Blossom Street York YO2 2AP York YO2 2AP (GB)