(19)

(11)

EP 0 020 441 A1

(12)

(43) Date of publication: 07.01.1981 Bulletin 1981/01 (21) Application number: 79901223.0 (22) Date of filing: 18.10.1979

(51) International Patent Classification (IPC):  A45D 20/ 10( . ) F04D 25/ 08( . ) A45D 20/ 12( . ) (86) International application number: PCT/GB1979/000165 (87) International publication number: WO 1980/000783 (01.05.1980 Gazette 1980/10)

(84) Designated Contracting States: CH DE FR GB LU NL SE (30) Priority: 20.10.1978 GB 19410034178 (71) Applicant: FIRTH CLEVELAND LIMITED London WC2B 6LG (GB)	(72) Inventor: DYER-HUGH, Edric Trenchard Wimborne, Dorset (GB) (74) Representative: Cundy, Anthony Brian, et al  Guest Keen and Nettlefolds plc Group Patents and Licensing Department P.O.Box 55 Ipsley House Ipsley Church Lane Redditch Worcestershire B98 0TL Redditch Worcestershire B98 0TL (GB)