(19)

(11)

EP 0 210 214 A1

(12)

(43) Date of publication: 04.02.1987 Bulletin 1987/06 (21) Application number: 86900807.0 (22) Date of filing: 21.01.1986

(51) International Patent Classification (IPC):  H04R 17/ 00( . ) (86) International application number: PCT/GB1986/000038 (87) International publication number: WO 1986/004477 (31.07.1986 Gazette 1986/17)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 21.01.1985 GB 19850001475 (71) Applicant: JONES, Thomas Griffith Lutterworth Leicestershire (GB)	(72) Inventor: JONES, Thomas Griffith Lutterworth Leicestershire (GB)