(19)

(11)

EP 0 259 298 A1

(12)

(43) Date of publication: 16.03.1988 Bulletin 1988/11 (21) Application number: 86900814.0 (22) Date of filing: 23.01.1986

(51) International Patent Classification (IPC):  F42B 7/ 08( . ) F42B 7/ 10( . ) (86) International application number: PCT/GB1986/000045 (87) International publication number: WO 1987/004513 (30.07.1987 Gazette 1987/17)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (71) Applicant: JOHNSON, Peter Ian Edgbaston, Birmingham B16 9HU (GB)	(72) Inventor: JOHNSON, Peter Ian Edgbaston, Birmingham B16 9HU (GB)