(19)

(11)

EP 0 725 561 A1

(12)

(43) Date of publication: 14.08.1996 Bulletin 1996/33 (21) Application number: 93918057.0 (22) Date of filing: 19.08.1993

(51) International Patent Classification (IPC):  A01B 5/ 14( . ) A01B 17/ 00( . ) A01B 15/ 14( . ) (86) International application number: PCT/GB1993/001764 (87) International publication number: WO 1994/010826 (26.05.1994 Gazette 1994/12)

(84) Designated Contracting States: DE DK ES FR GB IE IT NL (30) Priority: 17.11.1992 GB 19920024060 (71) Applicant: TOPHAM, Peter Douglas Temple St. Neots, Cambs. PE19 4XQ (GB)	(72) Inventor: TOPHAM, Peter Douglas Temple St. Neots, Cambs. PE19 4XQ (GB) (74) Representative: Price, Nigel John King  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)