(19)

(11)

EP 0 072 833 A1

(12)

(43) Date of publication: 02.03.1983 Bulletin 1983/09 (21) Application number: 82900607.0 (22) Date of filing: 26.02.1982

(51) International Patent Classification (IPC):  G07B 13/ 00( . ) (86) International application number: PCT/AU1982/000018 (87) International publication number: WO 1982/002970 (02.09.1982 Gazette 1982/21)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 26.02.1981 AU 19810007768 (71) Applicant: SCHMIDT ELECTRONIC LABORATORIES PTY. LTD. Elsternwick, Vic. 3185 (AU)	(72) Inventor: SCHMIDT, Gary Elsternwick, Vic.3185 (AU)