(19)

(11)

EP 0 220 310 A1

(12)

(43) Date of publication: 06.05.1987 Bulletin 1987/19 (21) Application number: 86903747.0 (22) Date of filing: 01.05.1986

(51) International Patent Classification (IPC):  A01K 1/ 00( . ) F24F 12/ 00( . ) F24F 7/ 08( . ) F24F 13/ 02( . ) (86) International application number: PCT/US1986/000948 (87) International publication number: WO 1986/006461 (06.11.1986 Gazette 1986/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 02.05.1985 US 19850729954 (71) Applicant: WILHELM, Anthony A. Ashland, WI 54806 (US)	(72) Inventor: MATTSON, Wallace, E. New London, MN 56273 (US)