(19)

(11)

EP 0 056 046 A1

(12)

(43) Date of publication: 21.07.1982 Bulletin 1982/29 (21) Application number: 81902039.0 (22) Date of filing: 24.07.1981

(51) International Patent Classification (IPC):  G09B 21/ 00( . ) G10L 13/ 04( . ) G09B 21/ 02( . ) (86) International application number: PCT/GB1981/000144 (87) International publication number: WO 1982/000381 (04.02.1982 Gazette 1982/04)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (30) Priority: 24.07.1980 GB 19800024236 (71) Applicants: ALBES, Zita Magda Eastbourne East Sussex (GB) JONES, Norman Barrie Leicester LE1 7RH (GB) WATSON, Jeremy Daniel McKendrick Burgess Hill West Sussex (GB)	(72) Inventors: ALBES, Zita Magda Eastbourne East Sussex (GB) JONES, Norman Barrie Leicester LE1 7RH (GB) WATSON, Jeremy Daniel McKendrick Burgess Hill West Sussex (GB) (74) Representative: Milhench, Howard Leslie  A.A. Thornton & Co. Northumberland House 303/306 High Holborn London, WC1V 7LE London, WC1V 7LE (GB)