(19)

(11)

EP 0 442 936 A1

(12)

(43) Date of publication: 28.08.1991 Bulletin 1991/35 (21) Application number: 89912760.0 (22) Date of filing: 10.11.1989

(51) International Patent Classification (IPC):  H04L 12/ 56( . ) (86) International application number: PCT/AU1989/000482 (87) International publication number: WO 1990/005419 (17.05.1990 Gazette 1990/11)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 10.11.1988 AU 19880001396 (71) Applicants: BUDRIKIS, Zigmantas Leonas Dalkeith, W.A. 6009 (AU) CANTONI, Antonio City Beach, W.A. 6015 (AU)	(72) Inventors: BUDRIKIS, Zigmantas Leonas Dalkeith, W.A. 6009 (AU) CANTONI, Antonio City Beach, W.A. 6015 (AU) (74) Representative: Senior, Alan Murray  J.A. KEMP & CO., 14 South Square, Gray's Inn London WC1R 5LX London WC1R 5LX (GB)