(19)

(11)

EP 0 070 856 A1

(12)

(43) Date of publication: 09.02.1983 Bulletin 1983/06 (21) Application number: 82900402.0 (22) Date of filing: 04.02.1982

(51) International Patent Classification (IPC):  E02F 3/ 96( . ) E21D 9/ 00( . ) E21C 37/ 26( . ) (86) International application number: PCT/SE1982/000027 (87) International publication number: WO 1982/002738 (19.08.1982 Gazette 1982/20)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 09.02.1981 SE 19810000879 (71) Applicant: FORSBERG, Axel M. S-414 68 Göteborg (SE)	(72) Inventor: FORSBERG, Axel M. S-414 68 Göteborg (SE)