(19)

(11)

EP 0 281 598 A1

(12)

(43) Date of publication: 14.09.1988 Bulletin 1988/37 (21) Application number: 87905902.0 (22) Date of filing: 04.09.1987

(51) International Patent Classification (IPC):  G11B 5/ 72( . ) G11B 13/ 04( . ) G11B 5/ 82( . ) G11B 23/ 34( . ) (86) International application number: PCT/US1987/002243 (87) International publication number: WO 1988/002168 (24.03.1988 Gazette 1988/07)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 08.09.1986 US 19860904326 08.09.1986 US 19860904729 08.09.1986 US 19860904999 (71) Applicant: Unisys Corporation Blue Bell Pennsylvania 19424 (US)	(72) Inventors: BERTI, Eugenio, F. San Jose, CA 95120 (US) HERTE, Lawrence, F. Palo Alto, CA 94306 (US) (74) Representative: Eisenführ, Speiser & Partner  Martinistrasse 24 D-28195 Bremen D-28195 Bremen (DE)