(19)

(11)

EP 0 557 361 A1

(12)

(43) Date of publication: 01.09.1993 Bulletin 1993/35 (21) Application number: 91920042.0 (22) Date of filing: 18.11.1991

(51) International Patent Classification (IPC):  G09F 9/ 35( . ) (86) International application number: PCT/GB1991/002038 (87) International publication number: WO 1992/009061 (29.05.1992 Gazette 1992/12)

(84) Designated Contracting States: DE FR GB (30) Priority: 16.11.1990 GB 19900025017 (71) Applicant: CLARES EQUIPMENT LIMITED Wells Somerset BA5 1UT (GB)	(72) Inventor: GRIFFITHS, Roy Garrad Bath, Avon BA2 4LR (GB) (74) Representative: Perkins, Sarah, et al  Page White & Farrer, 54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)