(19)

(11)

EP 0 135 546 A1

(12)

(43) Date of publication: 03.04.1985 Bulletin 1985/14 (21) Application number: 84900867.0 (22) Date of filing: 22.02.1984

(51) International Patent Classification (IPC):  G05B 19/ 21( . ) G05D 3/ 12( . ) G05B 19/ 23( . ) (86) International application number: PCT/GB1984/000056 (87) International publication number: WO 1984/003368 (30.08.1984 Gazette 1984/21)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 22.02.1983 GB 19830004881 (71) Applicant: PRUTEC LIMITED London EC1N 2NH (GB)	(72) Inventor: NEWMAN, Perran, Vincent, Leonard Whittlesford Cambridge CB2 4NT (GB) (74) Representative: Messulam, Alec Moses  A. Messulam & Co. 24 Broadway Leigh on Sea Essex SS9 1BN Leigh on Sea Essex SS9 1BN (GB)