(19)

(11)

EP 0 455 689 A1

(12)

(43) Date of publication: 13.11.1991 Bulletin 1991/46 (21) Application number: 90902345.0 (22) Date of filing: 25.01.1990

(51) International Patent Classification (IPC):  A01M 7/ 00( . ) B05B 7/ 08( . ) (86) International application number: PCT/GB1990/000106 (87) International publication number: WO 1990/008464 (09.08.1990 Gazette 1990/19)

(84) Designated Contracting States: DE DK FR GB IT NL (30) Priority: 25.01.1989 GB 19890001564 (71) Applicant: NATIONAL RESEARCH DEVELOPMENT CORPORATION London SE1 6BU (GB)	(72) Inventors: JEFFERY, John Christopher Ludlow, Shropshire SY8 4BN (GB) MILLER, Paul Charles Harvey Haynes, Bedford MK45 3QH (GB) (74) Representative: Chandler, Derek Richard, et al  Patents Department British Technology Group Ltd 101 Newington Causeway London SE1 6BU London SE1 6BU (GB)