(19)

(11)

EP 0 128 137 A1

(12)

(43) Date of publication: 19.12.1984 Bulletin 1984/51 (21) Application number: 82903503.0 (22) Date of filing: 27.09.1982

(51) International Patent Classification (IPC):  E01B( . ) E02F 5/ 32( . ) E02F 9/ 28( . ) (86) International application number: PCT/US1982/001345 (87) International publication number: WO 1984/001397 (12.04.1984 Gazette 1984/10)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (71) Applicant: CATERPILLAR TRACTOR CO. Peoria, Illinois 61629 (US)	(72) Inventor: ROUSSIN, Michael, A. Peoria, IL 61614 (US)