(19)

(11)

EP 0 348 414 A1

(12)

(43) Date of publication: 03.01.1990 Bulletin 1990/01 (21) Application number: 88902079.0 (22) Date of filing: 23.02.1988

(51) International Patent Classification (IPC):  G08C 19/ 28( . ) H04W 88/ 18( . ) (86) International application number: PCT/AU1988/000049 (87) International publication number: WO 1988/006385 (25.08.1988 Gazette 1988/19)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 23.02.1987 AU 19860000486 (71) Applicant: ZEENG, Pauline East Bentleigh, VIC 3165 (AU)	(72) Inventors: LEIVENZON, Simon Caulfield South, VIC 3162 (AU) HAWKINS, Raymond, Russel Cranbourne, VIC 3977 (AU) MASON, Christopher, J. Eltham, VIC 3095 (AU) (74) Representative: Rackham, Stephen Neil, et al  GILL JENNINGS & EVERY, Broadgate House, 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)