(19)

(11)

EP 0 138 862 A1

(12)

(43) Date of publication: 02.05.1985 Bulletin 1985/18 (21) Application number: 84900998.0 (22) Date of filing: 07.03.1984

(51) International Patent Classification (IPC):  F24H 3/ 04( . ) F24H 9/ 20( . ) (86) International application number: PCT/GB1984/000070 (87) International publication number: WO 1984/003552 (13.09.1984 Gazette 1984/22)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 07.03.1983 GB 19830006199 (71) Applicant: SKILTEN ELECTRONICS LIMITED Hertfordshire AL6 9TP (GB)	(72) Inventor: BOWSKILL, Robert 115 Orchard Way Hertfordshire S63 6BT (GB)