(19)

(11)

EP 0 215 018 A1

(12)

(43) Date of publication: 25.03.1987 Bulletin 1987/13 (21) Application number: 86901105.0 (22) Date of filing: 06.02.1986

(51) International Patent Classification (IPC):  G10H 3/ 14( . ) (86) International application number: PCT/GB1986/000065 (87) International publication number: WO 1986/004718 (14.08.1986 Gazette 1986/18)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 06.02.1985 GB 19850002994 30.05.1985 GB 19850013646 (71) Applicant: SIMMONS ELECTRONICS LTD. St. Albans Hertfordshire AL4 OJH (GB)	(72) Inventor: SIMMONS, David Welwyn Hertfordshire AL6 OHA (GB) (74) Representative: Crawford, Andrew Birkby, et al  A.A. THORNTON & CO. Northumberland House 303-306 High Holborn London WC1V 7LE London WC1V 7LE (GB)