(19)

(11)

EP 0 199 775 A1

(12)

(43) Date of publication: 05.11.1986 Bulletin 1986/45 (21) Application number: 85905418.0 (22) Date of filing: 30.10.1985

(51) International Patent Classification (IPC):  A01D 82/ 00( . ) (86) International application number: PCT/GB1985/000493 (87) International publication number: WO 1986/002521 (09.05.1986 Gazette 1986/10)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 31.10.1984 US 19840666814 (71) Applicant: NATIONAL RESEARCH DEVELOPMENT CORPORATION London SE1 6BU (GB)	(72) Inventor: KLINNER, Wilfred Erwin Beechwood, Heath Lane Buckinghamshire MK17 8TN (GB)