(19)

(11)

EP 0 168 459 A1

(12)

(43) Date of publication: 22.01.1986 Bulletin 1986/04 (21) Application number: 85900697.0 (22) Date of filing: 17.01.1985

(51) International Patent Classification (IPC):  G11B 23/ 06( . ) (86) International application number: PCT/GB1985/000019 (87) International publication number: WO 1985/003377 (01.08.1985 Gazette 1985/17)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 17.01.1984 GB 19840001215 (71) Applicant: MADSU UK LIMITED London W1R 5FA (GB)	(72) Inventor: MURPHY, Terence, Walter, Daniel Orchard Cottage Hemingstone, Ipswich Suffolk IP6 9RJ (GB)