(19)

(11)

EP 0 197 931 A1

(12)

(43) Date of publication: 22.10.1986 Bulletin 1986/43 (21) Application number: 84904237.0 (22) Date of filing: 25.10.1984

(51) International Patent Classification (IPC):  G02B 5/ 28( . ) H01K 1/ 32( . ) (86) International application number: PCT/US1984/001734 (87) International publication number: WO 1986/002775 (09.05.1986 Gazette 1986/10)

(84) Designated Contracting States: AT BE CH DE FR GB LI NL SE (30) Priority: 23.10.1984 US 19840662581 (71) Applicant: DURO-TEST CORPORATION North Bergen, NJ 07047 (US)	(72) Inventor: WALSH, Peter, J. Stirling, NJ 07980 (US) (74) Representative: Patentanwälte Grünecker, Kinkeldey, Stockmair & Partner  Maximilianstrasse 58 D-80538 München D-80538 München (DE)