(19)

(11)

EP 0 270 646 A1

(12)

(43) Date of publication: 15.06.1988 Bulletin 1988/24 (21) Application number: 87904074.0 (22) Date of filing: 22.06.1987

(51) International Patent Classification (IPC):  G05B 9/ 03( . ) G06F 11/ 20( . ) (86) International application number: PCT/GB1987/000437 (87) International publication number: WO 1987/007967 (30.12.1987 Gazette 1987/29)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 20.06.1986 GB 19860015057 (71) Applicant: APPROVED PRODUCT TECHNOLOGY LIMITED Christchurch Dorset BH23 6DT (GB)	(72) Inventors: WOODHOUSE, Michael, Leonard Wimbourne Dorset (GB) NOTLEY, Michael, Garth Shawford Hampshire SO21 2BY (GB) WALES, Raymond, John Marchwood Southampton SO4 4UQ (GB) (74) Representative: Gold, Tibor Z., et al  Stephenson Harwood One, St. Paul's Churchyard London EC4M 8SH London EC4M 8SH (GB)