(19)

(11)

EP 0 047 749 A1

(12)

(43) Date of publication: 24.03.1982 Bulletin 1982/12 (21) Application number: 81900439.0 (22) Date of filing: 23.02.1981

(51) International Patent Classification (IPC):  H02H 3/ 093( . ) H02H 3/ 10( . ) (86) International application number: PCT/GB1981/000026 (87) International publication number: WO 1981/002496 (03.09.1981 Gazette 1981/21)

(84) Designated Contracting States: DE FR GB SE (30) Priority: 23.02.1980 GB 19800006199 (71) Applicant: GEORGE ELLISON LIMITED Birmingham B42 2TD (GB)	(72) Inventors: SMART, Ivan Frank Walmley Sutton Coldfield West Midlands (GB) BURGESS, Trevor Kidderminster, Worcestershire (GB) (74) Representative: Prutton, Roger, et al  MARKS & CLERK, Alpha Tower, Suffolk Street Queensway Birmingham B1 1TT Birmingham B1 1TT (GB)