(19)

(11)

EP 0 203 913 A1

(12)

(43) Date of publication: 10.12.1986 Bulletin 1986/50 (21) Application number: 84900485.0 (22) Date of filing: 13.01.1984

(51) International Patent Classification (IPC):  G05B 9/ 02( . ) G08B 1/ 08( . ) H04Q 9/ 14( . ) G05B 24/ 02( . ) H04M 11/ 00( . ) (86) International application number: PCT/AU1984/000007 (87) International publication number: WO 1985/003159 (18.07.1985 Gazette 1985/16)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (71) Applicant: SENTRON LIMITED West Perth, W.A.6005 (AU)	(72) Inventor: KENNY, Thomas Michael Perth, W.A. (AU) (74) Representative: Johnson, Terence Leslie, et al  Edward Evans & Co. Chancery House 53-64 Chancery Lane London WC2A 1SD London WC2A 1SD (GB)