(19)

(11)

EP 0 473 752 A1

(12)

(43) Date of publication: 11.03.1992 Bulletin 1992/11 (21) Application number: 91905818.0 (22) Date of filing: 20.03.1991

(51) International Patent Classification (IPC):  A01M 21/ 04( . ) (86) International application number: PCT/GB1991/000424 (87) International publication number: WO 1991/014363 (03.10.1991 Gazette 1991/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 21.03.1990 GB 19900006342 23.10.1990 GB 19900023059 (71) Applicant: HUMPHREY, Ernest Deryck Colchester, Essex C04 4LN (GB)	(72) Inventor: HUMPHREY, Ernest Deryck Colchester, Essex C04 4LN (GB) (74) Representative: Gillam, Francis Cyril, et al  SANDERSON & CO. European Patent Attorneys 34, East Stockwell Street Colchester Essex CO1 1ST Colchester Essex CO1 1ST (GB)