(19)

(11)

EP 0 580 670 A1

(12)

(43) Date of publication: 02.02.1994 Bulletin 1994/05 (21) Application number: 92908289.0 (22) Date of filing: 16.04.1992

(51) International Patent Classification (IPC):  H01J 29/ 00( . ) H01J 29/ 86( . ) H01J 29/ 76( . ) (86) International application number: PCT/GB1992/000706 (87) International publication number: WO 1992/019003 (29.10.1992 Gazette 1992/27)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 18.04.1991 GB 19910083659 (71) Applicant: RANK BRIMAR LIMITED Manchester M24 1SN (GB)	(72) Inventors: ETHERINGTON, David, George 14 Piethorne Close Rochdale OL16 3RH (GB) BARTEN, Peter NL-5511 KC Knegsel (NL) (74) Representative: Beresford, Keith Denis Lewis, et al  BERESFORD & Co. 2-5 Warwick Court High Holborn London WC1R 5DJ London WC1R 5DJ (GB)