(19)

(11)

EP 0 604 502 A1

(12)

(43) Date of publication: 06.07.1994 Bulletin 1994/27 (21) Application number: 92919493.0 (22) Date of filing: 17.09.1992

(51) International Patent Classification (IPC):  G08B 17/ 107( . ) G08B 29/ 24( . ) (86) International application number: PCT/GB1992/001709 (87) International publication number: WO 1993/006462 (01.04.1993 Gazette 1993/09)

(84) Designated Contracting States: DE DK (30) Priority: 18.09.1991 GB 19910019942 (71) Applicant: KIDDE-GRAVINER LIMITED Derby DE2 4EE (GB)	(72) Inventors: VARNEY, Peter Windsor, Berkshire SL4 5BJ (GB) JAMES, F. John Bracknell, Berkshire RG12 8XR (GB) BALL, David Nicholas Windsor, Berkshire SL4 3BH (GB) (74) Representative: Foster, David Martyn  MATHISEN MACARA & CO. The Coach House 6-8 Swakeleys Road Ickenham Uxbridge UB10 8BZ Ickenham Uxbridge UB10 8BZ (GB)