(19)

(11)

EP 0 138 937 A1

(12)

(43) Date of publication: 02.05.1985 Bulletin 1985/18 (21) Application number: 84901387.0 (22) Date of filing: 28.03.1984

(51) International Patent Classification (IPC):  G08B 13/ 00( . ) (86) International application number: PCT/GB1984/000104 (87) International publication number: WO 1984/003974 (11.10.1984 Gazette 1984/24)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 30.03.1983 GB 19830008764 (71) Applicant: GUNTON, Bruce Stanley Sutton Coldfield West Midlands B74 4ES (GB)	(72) Inventor: GUNTON, Bruce Stanley Sutton Coldfield West Midlands B74 4ES (GB)