(19)

(11)

EP 0 203 953 A1

(12)

(43) Date of publication: 10.12.1986 Bulletin 1986/50 (21) Application number: 85905854.0 (22) Date of filing: 18.11.1985

(51) International Patent Classification (IPC):  H01T 13/ 46( . ) (86) International application number: PCT/GB1985/000523 (87) International publication number: WO 1986/003067 (22.05.1986 Gazette 1986/11)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 17.11.1984 GB 19840029122 18.05.1985 GB 19850012606 (71) Applicant: DAWSON ROYALTIES LIMITED Radcliffe, Manchester M26 0RU (GB)	(72) Inventor: GIBSON-DAWSON, Joseph Manchester M25 5ET (GB)