(19)

(11)

EP 0 177 542 A1

(12)

(43) Date of publication: 16.04.1986 Bulletin 1986/16 (21) Application number: 85901533.0 (22) Date of filing: 12.04.1985

(51) International Patent Classification (IPC):  G06K 7/ 016( . ) G07F 7/ 02( . ) G06K 19/ 06( . ) (86) International application number: PCT/GB1985/000165 (87) International publication number: WO 1985/004971 (07.11.1985 Gazette 1985/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 18.04.1984 GB 19840010100 (71) Applicant: GEC TRAFFIC AUTOMATION LIMITED Borehamwood Hertfordshire WD6 1RX (GB)	(72) Inventor: STANFORD, Christopher, John Harpenden, Hertfordshire AL5 3BW (GB)