(19)

(11)

EP 0 281 561 A1

(12)

(43) Date of publication: 14.09.1988 Bulletin 1988/37 (21) Application number: 86906892.0 (22) Date of filing: 25.11.1986

(51) International Patent Classification (IPC):  G06F 9/ 42( . ) G06F 12/ 08( . ) (86) International application number: PCT/GB1986/000719 (87) International publication number: WO 1987/003395 (04.06.1987 Gazette 1987/12)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 25.11.1985 GB 19850028984 (71) Applicant: LINN PRODUCTS LIMITED Glasgow G76 OPE (GB)	(72) Inventor: HARLAND, David, Michael Glasgow G20 (GB) (74) Representative: Fitzpatrick, Hugh Ivor Brunton  Fitzpatricks 4 West Regent Street Glasgow G2 1RS Glasgow G2 1RS (GB)