(19)

(11)

EP 0 338 029 A1

(12)

(43) Date of publication: 25.10.1989 Bulletin 1989/43 (21) Application number: 88905934.0 (22) Date of filing: 01.07.1988

(51) International Patent Classification (IPC):  G06F 3/ 153( . ) (86) International application number: PCT/GB1988/000513 (87) International publication number: WO 1989/000314 (12.01.1989 Gazette 1989/02)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL (30) Priority: 01.07.1987 GB 19870015498 (71) Applicant: GRUNDON TECHNOLOGIES LIMITED Dorset DT2 9DR (GB)	(72) Inventors: GRUNDON, Keith, Richard Dorchester Dorset DT2 9DR (GB) GRUNDON, Mark, Richard Maiden Newton Nr. Dorchester Dorset (GB) (74) Representative: Lomas, Geoffrey Michael  Barker, Brettell & Boutland Prudential Buildings 97-101 Above Bar Street Southampton SO9 4GT Southampton SO9 4GT (GB)