(19)

(11)

EP 0 555 299 A1

(12)

(43) Date of publication: 18.08.1993 Bulletin 1993/33 (21) Application number: 91918836.0 (22) Date of filing: 29.10.1991

(51) International Patent Classification (IPC):  H02P 8/ 14( . ) H02P 25/ 02( . ) H02P 8/ 42( . ) (86) International application number: PCT/GB1991/001886 (87) International publication number: WO 1992/008277 (14.05.1992 Gazette 1992/11)

(84) Designated Contracting States: BE DE FR GB IT SE (30) Priority: 31.10.1990 GB 19900023693 (71) Applicant: NMB (UK) LIMITED London W1 (GB)	(72) Inventor: SADLER, Gordon Wokingham, Berks RG11 1QH (GB) (74) Representative: Crawford, Andrew Birkby  A.A. THORNTON & CO. Northumberland House 303-306 High Holborn London WC1V 7LE London WC1V 7LE (GB)