(19)

(11)

EP 0 135 552 A1

(12)

(43) Date of publication: 03.04.1985 Bulletin 1985/14 (21) Application number: 84900950.0 (22) Date of filing: 05.03.1984

(51) International Patent Classification (IPC):  G01V 1/ 34( . ) G02B 13/ 08( . ) (86) International application number: PCT/AU1984/000034 (87) International publication number: WO 1984/003567 (13.09.1984 Gazette 1984/22)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 04.03.1983 AU 19830008312 (71) Applicant: WIDIGER, Michael Bernard Via Beaudesert, QLD 4285 (AU)	(72) Inventor: WIDIGER, Michael Bernard Via Beaudesert, QLD 4285 (AU)