(19)

(11)

EP 0 199 724 A1

(12)

(43) Date of publication: 05.11.1986 Bulletin 1986/45 (21) Application number: 85900150.0 (22) Date of filing: 07.12.1984

(51) International Patent Classification (IPC):  G10H 1/ 34( . ) G10H 3/ 18( . ) G10H 3/ 14( . ) (86) International application number: PCT/GB1984/000422 (87) International publication number: WO 1985/002705 (20.06.1985 Gazette 1985/14)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 09.12.1983 GB 19830032906 (71) Applicant: STEPP ELECTRONICS LIMITED London NW1 6XN (GB)	(72) Inventor: SIMMONS, David Hertfordshire AL4 0JH (GB)