(19)

(11)

EP 0 077 329 A1

(12)

(43) Date of publication: 27.04.1983 Bulletin 1983/17 (21) Application number: 81901833.0 (22) Date of filing: 27.04.1981

(51) International Patent Classification (IPC):  G01L 7/ 06( . ) G01L 9/ 00( . ) (86) International application number: PCT/US1981/000552 (87) International publication number: WO 1982/003916 (11.11.1982 Gazette 1982/27)

(84) Designated Contracting States: AT CH DE FR GB LI NL SE (71) Applicant: CATERPILLAR TRACTOR CO. Peoria, Illinois 61629 (US)	(72) Inventor: FUZZELL, Joe E. Peoria, IL 61604 (US)