(19)

(11)

EP 0 065 951 A1

(12)

(43) Date of publication: 08.12.1982 Bulletin 1982/49 (21) Application number: 81902380.0 (22) Date of filing: 25.08.1981

(51) International Patent Classification (IPC):  H01T 4/ 16( . ) H01T 4/ 20( . ) (86) International application number: PCT/GB1981/000168 (87) International publication number: WO 1982/000926 (18.03.1982 Gazette 1982/08)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (30) Priority: 28.08.1980 GB 19800027658 (71) Applicant: BOWTHORPE EMP LIMITED East Sussex BN2 2DF (GB)	(72) Inventor: DOONE, Rodney Meredith Burgess Hill West Sussex (GB) (74) Representative: Milhench, Howard Leslie  A.A. Thornton & Co. Northumberland House 303/306 High Holborn London, WC1V 7LE London, WC1V 7LE (GB)