(19)

(11)

EP 0 102 998 A1

(12)

(43) Date of publication: 21.03.1984 Bulletin 1984/12 (21) Application number: 83900949.0 (22) Date of filing: 18.03.1983

(51) International Patent Classification (IPC):  G11B 20/ 00( . ) G11B 27/ 32( . ) G11B 23/ 28( . ) (86) International application number: PCT/GB1983/000082 (87) International publication number: WO 1983/003321 (29.09.1983 Gazette 1983/23)

(84) Designated Contracting States: AT BE CH DE FR LI LU NL SE (30) Priority: 19.03.1982 GB 19820008156 (71) Applicant: KEGMATICS LIMITED Southampton SO3 1DH (GB)	(72) Inventor: RAGGETT, Stephen Richard Burlesdon Hampshire (GB)