(19)

(11)

EP 0 357 613 A1

(12)

(43) Date of publication: 14.03.1990 Bulletin 1990/11 (21) Application number: 88902264.0 (22) Date of filing: 03.03.1988

(51) International Patent Classification (IPC):  G11B 23/ 023( . ) G11B 33/ 04( . ) (86) International application number: PCT/SE1988/000094 (87) International publication number: WO 1988/006794 (07.09.1988 Gazette 1988/20)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 03.03.1987 SE 19870000875 (71) Applicant: FRODELIUS, Jan-Erik S-524 00 Herrljunga (SE)	(72) Inventor: FRODELIUS, Jan-Erik S-524 00 Herrljunga (SE) (74) Representative: Tiedtke, Harro, Dipl.-Ing., et al  Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4 D-80336 München D-80336 München (DE)