(19)

(11)

EP 0 273 906 A1

(12)

(43) Date of publication: 13.07.1988 Bulletin 1988/28 (21) Application number: 86905166.0 (22) Date of filing: 01.09.1986

(51) International Patent Classification (IPC):  F23N 5/ 12( . ) (86) International application number: PCT/AU1986/000258 (87) International publication number: WO 1987/001435 (12.03.1987 Gazette 1987/06)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 02.09.1985 AU 19850002227 (71) Applicant: THE BROKEN HILL PROPRIETARY COMPANY LIMITED Melbourne, Victoria 3000 (AU)	(72) Inventor: KEMLO, Kenneth, Garry Lambton, NSW 2291 (AU) (74) Representative: Lerwill, John, et al  A.A. Thornton & Co. Northumberland House 303-306 High Holborn London, WC1V 7LE London, WC1V 7LE (GB)