(19)

(11)

EP 0 151 602 A1

(12)

(43) Date of publication: 21.08.1985 Bulletin 1985/34 (21) Application number: 84902900.0 (22) Date of filing: 30.07.1984

(51) International Patent Classification (IPC):  G09B 9/ 08( . ) G09B 9/ 20( . ) G09B 9/ 40( . ) G09B 9/ 54( . ) G09B 9/ 16( . ) G09B 9/ 24( . ) G09B 9/ 46( . ) (86) International application number: PCT/AU1984/000147 (87) International publication number: WO 1985/000912 (28.02.1985 Gazette 1985/05)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 03.08.1983 AU 19830000635 (71) Applicant: THE COMMONWEALTH OF AUSTRALIA Canberra, Australian Capital Territory 2600 (AU)	(72) Inventors: LANE, Dallas, William Hope Valley, S.A. 5090 (AU) JARROTT, Kenneth, Noel Royston Park, S.A. 5070 (AU) (74) Representative: Opperman, Stuart Richard, et al  Haseltine Lake & Co. Hazlitt House 28 Southampton Buildings Chancery Lane London WC2A 1AT London WC2A 1AT (GB)