(19)

(11)

EP 0 052 122 A1

(12)

(43) Date of publication: 26.05.1982 Bulletin 1982/21 (21) Application number: 81901300.0 (22) Date of filing: 03.06.1981

(51) International Patent Classification (IPC):  G01N 23/ 04( . ) H04N 5/ 32( . ) H05G 1/ 26( . ) G01V 5/ 00( . ) H04N 7/ 18( . ) (86) International application number: PCT/AU1981/000068 (87) International publication number: WO 1981/003594 (10.12.1981 Gazette 1981/29)

(84) Designated Contracting States: CH DE FR GB LI NL SE (30) Priority: 03.06.1980 AU 19800003854 (71) Applicant: COMMONWEALTH OF AUSTRALIA Canberra A.C.T. 2600 (AU)

(72) Inventors: BROWN, Gregory Cleave Essendon, Vic, 3040 (AU) QUINN, James Dominic East Kew, Vic, 3102 (AU) SILVA, Stanley Robert Doncaster East, Vic, 3109 (AU) WILLIAMS, David William Strathmore, Vic, 3041 (AU) WU, Kenneth Kwan Mow Toorak, Vic, 3142 (AU) (74) Representative: Crawford, Andrew Birkby, et al  A.A. THORNTON & CO. Northumberland House 303-306 High Holborn London WC1V 7LE London WC1V 7LE (GB)