(19)

(11)

EP 0 082 147 A1

(12)

(43) Date of publication: 29.06.1983 Bulletin 1983/26 (21) Application number: 81902111.0 (22) Date of filing: 06.07.1981

(51) International Patent Classification (IPC):  G01R 31/ 02( . ) G01R 31/ 28( . ) (86) International application number: PCT/US1981/000904 (87) International publication number: WO 1983/000230 (20.01.1983 Gazette 1983/02)

(84) Designated Contracting States: DE FR GB (71) Applicant: GENERAL ELECTRIC COMPANY Schenectady New York 12305 (US)	(72) Inventor: GEISEL, Donald Joseph Madison, NY 13402 (US) (74) Representative: Wood, Anthony Charles, et al  Urquhart-Dykes & Lord 91 Wimpole Street London W1M 8AH London W1M 8AH (GB)