(19)

(11)

EP 0 722 613 A1

(12)

(43) Date of publication: 24.07.1996 Bulletin 1996/30 (21) Application number: 94927734.0 (22) Date of filing: 28.09.1994

(51) International Patent Classification (IPC):  H01C 1/ 12( . ) H01C 10/ 38( . ) H01C 10/ 34( . ) (86) International application number: PCT/GB1994/002107 (87) International publication number: WO 1995/009428 (06.04.1995 Gazette 1995/15)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 28.09.1993 GB 19930020011 (71) Applicant: COLVERN LIMITED Essex RM7 9LP (GB)	(72) Inventors: CAIRNS, Michael, Paul Essex RM8 3AU (GB) GOODINGE, John, William, Devereux Essex CM15 9ES (GB) STAINES, Collin, Leslie Essex RM10 9ET (GB) (74) Representative: Gallafent, Antony Xavier  Gallafent & Co., 9 Staple Inn London WC1V 7QH London WC1V 7QH (GB)