(19)

(11)

EP 0 083 601 A1

(12)

(43) Date of publication: 20.07.1983 Bulletin 1983/29 (21) Application number: 82901979.0 (22) Date of filing: 08.07.1982

(51) International Patent Classification (IPC):  G06K 7/ 10( . ) (86) International application number: PCT/GB1982/000202 (87) International publication number: WO 1983/000243 (20.01.1983 Gazette 1983/02)

(84) Designated Contracting States: AT BE CH DE FR LI LU NL SE (30) Priority: 13.07.1981 GB 19810021559 15.04.1982 GB 19820010981 08.06.1982 GB 19820016654 (71) Applicant: ROUNDEL ELECTRONICS LIMITED East Boldon Tyne & Wear NE36 0NP (GB)	(72) Inventor: ROBINSON, Alan William Chapel Road Newcastle-upon-Tyne (GB)