(19)

(11)

EP 0 142 524 A1

(12)

(43) Date of publication: 29.05.1985 Bulletin 1985/22 (21) Application number: 84901718.0 (22) Date of filing: 24.04.1984

(51) International Patent Classification (IPC):  G07B 13/ 00( . ) (86) International application number: PCT/AU1984/000070 (87) International publication number: WO 1984/004414 (08.11.1984 Gazette 1984/26)

(84) Designated Contracting States: AT BE CH DE FR GB LI NL SE (30) Priority: 22.04.1983 AU 19830009025 (71) Applicant: HALDA SYSTEMS PTY. LTD. East Brunswick, VIC 3057 (AU)	(72) Inventor: FORDER, Vincent, Charles West Preston, VIC 3072 (AU)