(19)

(11)

EP 0 090 840 A1

(12)

(43) Date of publication: 12.10.1983 Bulletin 1983/41 (21) Application number: 82903153.0 (22) Date of filing: 13.10.1982

(51) International Patent Classification (IPC):  G04G 11/ 00( . ) G04G 13/ 02( . ) (86) International application number: PCT/GB1982/000291 (87) International publication number: WO 1983/001519 (28.04.1983 Gazette 1983/10)

(84) Designated Contracting States: CH DE FR GB LI (30) Priority: 13.10.1981 GB 19810030804 (71) Applicant: WEBB-JONES, Anthony Philip Hertfordshire (GB)	(72) Inventor: WEBB-JONES, Anthony Philip Hertfordshire (GB)