(19)

(11)

EP 0 391 918 A1

(12)

(43) Date of publication: 17.10.1990 Bulletin 1990/42 (21) Application number: 88908718.0 (22) Date of filing: 23.09.1988

(51) International Patent Classification (IPC):  H04M 19/ 04( . ) (86) International application number: PCT/GB1988/000785 (87) International publication number: WO 1989/003147 (06.04.1989 Gazette 1989/08)

(84) Designated Contracting States: GB (30) Priority: 24.09.1987 GB 19870022520 24.02.1988 GB 19880004268 (71) Applicants: BABER, Alan Bristol BS15 6AH (GB) GRIFFITH, David Stuart Bath BA83 3BY (GB) JONES, Kevin Rhys Bristol BS5 9Q9 (GB)	(72) Inventors: BABER, Alan Bristol BS15 6AH (GB) GRIFFITH, David Stuart Bath BA83 3BY (GB) JONES, Kevin Rhys Bristol BS5 9Q9 (GB) (74) Representative: Shaw, Laurence  5th Floor, Metropolitan House, 1 Hagley Road, Edgbaston Birmingham B16 8TG Birmingham B16 8TG (GB)