(19)

(11)

EP 0 557 468 A1

(12)

(43) Date of publication: 01.09.1993 Bulletin 1993/35 (21) Application number: 92911281.0 (22) Date of filing: 09.06.1992

(51) International Patent Classification (IPC):  A01C 15/ 02( . ) A01C 17/ 00( . ) (86) International application number: PCT/GB1992/001027 (87) International publication number: WO 1992/022195 (23.12.1992 Gazette 1992/32)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 11.06.1991 GB 19910012521 (71) Applicant: HORSTINE FARMERY LIMITED York YO4 3SP (GB)	(72) Inventor: SILVERSIDES, John Cottingham, Humberside HU16 4ET (GB) (74) Representative: Oulton, Richard John, et al  R J Oulton & Co, First Floor, Pearl Assurance Buildings, Land of Green Ginger Hull, Humberside HU1 2EA Hull, Humberside HU1 2EA (GB)