(19)

(11)

EP 0 073 786 A1

(12)

(43) Date of publication: 16.03.1983 Bulletin 1983/11 (21) Application number: 82900670.0 (22) Date of filing: 03.03.1982

(51) International Patent Classification (IPC):  E02D 31/ 02( . ) E04F 17/ 00( . ) E04F 15/ 02( . ) (86) International application number: PCT/NO1982/000011 (87) International publication number: WO 1982/003099 (16.09.1982 Gazette 1982/22)

(84) Designated Contracting States: AT BE CH DE FR GB LI NL SE (30) Priority: 11.03.1981 NO 19810000837 (71) Applicant: BERGSLAND, Jon N-Oslo 3 (NO)	(72) Inventor: BERGSLAND, Jon N-Oslo 3 (NO) (74) Representative: Nordén, Ake, et al  Oscar Grahn Patentbyra AB Box 19540 S-104 32 Stockholm S-104 32 Stockholm (SE)