(19)

(11)

EP 0 110 901 A1

(12)

(43) Date of publication: 20.06.1984 Bulletin 1984/25 (21) Application number: 83901572.0 (22) Date of filing: 31.05.1983

(51) International Patent Classification (IPC):  G11B 5/ 09( . ) G11B 20/ 20( . ) G11B 27/ 32( . ) G01V 1/ 32( . ) G11B 27/ 10( . ) (86) International application number: PCT/AU1983/000070 (87) International publication number: WO 1983/004337 (08.12.1983 Gazette 1983/28)

(84) Designated Contracting States: BE CH DE FR GB LI NL SE (30) Priority: 01.06.1982 AU 19820004236 (71) Applicant: THE COMMONWEALTH OF AUSTRALIA Canberra, Australian Capital Territory 2600 (AU)	(72) Inventor: DICKENS, John D. Raleigh Road Maribyrnong, Vic 3032 (AU) (74) Representative: Newby, Martin John, et al  J.Y. & G.W. Johnson Furnival House 14-18 High Holborn London WC1V 6DE London WC1V 6DE (GB)