(19)

(11)

EP 0 093 714 A1

(12)

(43) Date of publication: 16.11.1983 Bulletin 1983/46 (21) Application number: 82901281.0 (22) Date of filing: 01.04.1982

(51) International Patent Classification (IPC):  G11B 25/ 04( . ) G11B 17/ 32( . ) G11B 5/ 60( . ) G11B 23/ 50( . ) (86) International application number: PCT/US1982/000387 (87) International publication number: WO 1983/001861 (26.05.1983 Gazette 1983/13)

(84) Designated Contracting States: CH DE FR GB LI SE (30) Priority: 16.11.1981 US 19810321335 (71) Applicant: DMA SYSTEMS CORPORATION Santa Barbara, CA 93101 (US)	(72) Inventor: POLLOCK, William A. Santa Barbara, CA 93109 (US) (74) Representative: Zenz, Joachim Klaus, Dipl.-Ing.  Am Ruhrstein 1 D-45133 Essen D-45133 Essen (DE)