(19)

(11)

EP 0 023 505 A1

(12)

(43) Date of publication: 11.02.1981 Bulletin 1981/06 (21) Application number: 80900315.0 (22) Date of filing: 07.02.1980

(51) International Patent Classification (IPC):  E03F 5/ 04( . ) (86) International application number: PCT/SE1980/000038 (87) International publication number: WO 1980/001701 (21.08.1980 Gazette 1980/19)

(84) Designated Contracting States: AT CH DE FR GB NL (30) Priority: 09.02.1979 SE 19790001158 (71) Applicant: SÖDERSTRÖM, Gert Wilhelm S-194 00 Upplands Väsby (SE)	(72) Inventor: SÖDERSTRÖM, Gert Wilhelm S-194 00 Upplands Väsby (SE) (74) Representative: Onn, Thorsten, et al  AB Stockholms Patentbyra Zacco & Bruhn P.O. Box 23101 S-104 35 Stockholm S-104 35 Stockholm (SE)