(19)

(11)

EP 0 471 666 A1

(12)

(43) Date of publication: 26.02.1992 Bulletin 1992/09 (21) Application number: 89912749.0 (22) Date of filing: 07.11.1989

(51) International Patent Classification (IPC):  E01C 5/ 00( . ) E01C 11/ 22( . ) (86) International application number: PCT/US1989/005014 (87) International publication number: WO 1990/005213 (17.05.1990 Gazette 1990/11)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 07.11.1988 US 19880268290 (71) Applicant: GOSNELL, Glenn D Torrance, CA 90505 (US)	(72) Inventor: GOSNELL, Glenn D Torrance, CA 90505 (US) (74) Representative: Baillie, Iain Cameron, et al  c/o Ladas & Parry Altheimer Eck 2 D-80331 München D-80331 München (DE)