(19)

(11)

EP 0 020 421 A1

(12)

(43) Date of publication: 07.01.1981 Bulletin 1981/01 (21) Application number: 79901197.0 (22) Date of filing: 01.10.1979

(51) International Patent Classification (IPC):  G03B 17/ 08( . ) (86) International application number: PCT/SE1979/000198 (87) International publication number: WO 1980/000881 (01.05.1980 Gazette 1980/10)

(84) Designated Contracting States: FR (30) Priority: 29.09.1978 SE 19780010261 (71) Applicant: MACHINATOR AB S-753 31 Uppsala (SE)	(72) Inventors: AXEN, Jan-Eric S-755 90 Uppsala (SE) LINDBERG, Bengt S-752 27 Uppsala (SE) ÖSTLIN, Henrik S-752 24 Uppsala (SE)