(19)

(11)

EP 0 093 773 A1

(12)

(43) Date of publication: 16.11.1983 Bulletin 1983/46 (21) Application number: 83900136.0 (22) Date of filing: 15.11.1982

(51) International Patent Classification (IPC):  G01V 8/ 12( . ) G08B 13/ 18( . ) G08B 13/ 00( . ) G08B 13/ 187( . ) (86) International application number: PCT/US1982/001615 (87) International publication number: WO 1983/001855 (26.05.1983 Gazette 1983/13)

(84) Designated Contracting States: DE FR GB NL SE (30) Priority: 19.11.1981 US 19810322847 (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul, Minnesota 55133-3427 (US)	(72) Inventor: NOTHAFT, Eugene M. Saint Paul, MN 55133 (US) (74) Representative: Madgwick, Paul Roland, et al  Ladas & Parry Altheimer Eck 2 D-80331 München D-80331 München (DE)