(19)

(11)

EP 0 910 846 A1

(12)

(43) Date of publication: 28.04.1999 Bulletin 1999/17 (21) Application number: 98906753.0 (22) Date of filing: 12.03.1998

(51) International Patent Classification (IPC):  G06F 17/ 40( . ) G07C 1/ 10( . ) G09B 29/ 00( . ) G06K 19/ 067( . ) G07C 3/ 00( . ) H04B 17/ 00( . ) (86) International application number: PCT/AU1998/000153 (87) International publication number: WO 1998/040865 (17.09.1998 Gazette 1998/37)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV RO SI (30) Priority: 12.03.1997 AU 1997PO05623 (71) Applicant: Total Plant Control Australasia Pty. Limited Scoresby, VIC 3179 (AU)	(72) Inventor: DEBY, Kurt Scoresby, VIC 3179 (AU) (74) Representative: Bayliss, Geoffrey Cyril, et al  BOULT WADE TENNANT, 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)