(19)

(11)

EP 0 426 760 A1

(12)

(43) Date of publication: 15.05.1991 Bulletin 1991/20 (21) Application number: 89909635.0 (22) Date of filing: 25.08.1989

(51) International Patent Classification (IPC):  E01C 7/ 08( . ) E01C 17/ 00( . ) E01C 7/ 35( . ) (86) International application number: PCT/SE1989/000447 (87) International publication number: WO 1990/002226 (08.03.1990 Gazette 1990/06)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 26.08.1988 SE 19880002996 (71) Applicant: LABINO PATENT AB S-890 23 Själevad (SE)	(72) Inventor: BERGKVIST, Lars, A. S-890 23 Själevad (SE) (74) Representative: Örtenblad, Bertil Tore  Noréns Patentbyra AB Box 27034 S-102 51 Stockholm S-102 51 Stockholm (SE)