(19)

(11)

EP 0 533 777 A1

(12)

(43) Date of publication: 31.03.1993 Bulletin 1993/13 (21) Application number: 91911222.0 (22) Date of filing: 13.06.1991

(51) International Patent Classification (IPC):  G01G 3/ 14( . ) G01G 21/ 22( . ) G01G 17/ 08( . ) G01G 21/ 23( . ) (86) International application number: PCT/AU1991/000252 (87) International publication number: WO 1991/019960 (26.12.1991 Gazette 1991/29)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 14.06.1990 AU 19900000642 10.08.1990 AU 19900001663 (71) Applicant: KELLENBACH, Arthur St. Ives, NSW 2075 (AU)	(72) Inventor: KELLENBACH, Arthur St. Ives, NSW 2075 (AU) (74) Representative: Rees, David Christopher, et al  Kilburn & Strode 30 John Street London WC1N 2DD London WC1N 2DD (GB)