(19)

(11)

EP 0 868 733 A1

(12)

(43) Date of publication: 07.10.1998 Bulletin 1998/41 (21) Application number: 96942478.0 (22) Date of filing: 18.12.1996

(51) International Patent Classification (IPC):  H01F 1/ 153( . ) (86) International application number: PCT/GB1996/003122 (87) International publication number: WO 1997/022978 (26.06.1997 Gazette 1997/27)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GR IE IT LI LU NL PT SE (30) Priority: 18.12.1995 GB 19950025875 (71) Applicant: Telcon Limited Crawley, West Sussex RH10 2RB (GB)	(72) Inventors: MAJOR, Rodney Pound Hill Crawley West Sussex RH10 7EF (GB) PARMAR, Baljit Hitchin Hertfordshire SG4 9LD (GB) DAVIES, Hywel Dore Sheffield S17 3PE (GB) (74) Representative: Carpmael, John William Maurice, et al  CARPMAELS & RANSFORD 43 Bloomsbury Square London, WC1A 2RA London, WC1A 2RA (GB)