(19)

(11)

EP 0 065 572 A1

(12)

(43) Date of publication: 01.12.1982 Bulletin 1982/48 (21) Application number: 82900241.0 (22) Date of filing: 04.12.1981

(51) International Patent Classification (IPC):  G01D 3/ 02( . ) G01R 15/ 00( . ) (86) International application number: PCT/US1981/001619 (87) International publication number: WO 1982/002095 (24.06.1982 Gazette 1982/16)

(84) Designated Contracting States: AT CH DE FR GB LI NL SE (30) Priority: 08.12.1980 US 19800214327 (71) Applicant: AMETEK, INC. New York, New York 10022 (US)	(72) Inventor: DURKIN, Joseph J. Philadelphia, PA 19116 (US) (74) Representative: Dixon, Donald Cossar, et al  Gee & Co. Chancery House Chancery Lane London WC2A 1QU London WC2A 1QU (GB)