(19)

(11)

EP 0 305 452 A1

(12)

(43) Date of publication: 08.03.1989 Bulletin 1989/10 (21) Application number: 88902368.0 (22) Date of filing: 11.03.1988

(51) International Patent Classification (IPC):  G01G 21/ 23( . ) G01L 1/ 26( . ) (86) International application number: PCT/AU1988/000065 (87) International publication number: WO 1988/007177 (22.09.1988 Gazette 1988/21)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 11.03.1987 AU 19870000797 (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)