(19)

(11)

EP 0 155 957 A1

(12)

(43) Date of publication: 02.10.1985 Bulletin 1985/40 (21) Application number: 84903420.0 (22) Date of filing: 07.09.1984

(51) International Patent Classification (IPC):  G01V 1/ 155( . ) (86) International application number: PCT/AU1984/000173 (87) International publication number: WO 1985/001359 (28.03.1985 Gazette 1985/08)

(84) Designated Contracting States: DE FR GB (30) Priority: 09.09.1983 AU 19830001331 (71) Applicant: UNISEARCH LIMITED Kensington New South Wales, 2033 (AU)	(72) Inventor: STEWART, David, Brian Weetangera, ACT 2614 (AU)