(19)

(11)

EP 0 505 420 A1

(12)

(43) Date of publication: 30.09.1992 Bulletin 1992/40 (21) Application number: 91900813.0 (22) Date of filing: 14.12.1990

(51) International Patent Classification (IPC):  F28D 9/ 00( . ) F28F 3/ 08( . ) (86) International application number: PCT/FI1990/000297 (87) International publication number: WO 1991/009262 (27.06.1991 Gazette 1991/14)

(84) Designated Contracting States: CH DE DK FR GB LI SE (30) Priority: 14.12.1989 FI 19890005996 (71) Applicant: KONTU, Mauri SF-23660 Kalanti (FI)	(72) Inventor: KONTU, Mauri SF-23660 Kalanti (FI) (74) Representative: Pendlebury, Anthony  PAGE, WHITE & FARRER 54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)