(19)

(11)

EP 0 546 042 A1

(12)

(43) Date of publication: 16.06.1993 Bulletin 1993/24 (21) Application number: 91915856.0 (22) Date of filing: 27.08.1991

(51) International Patent Classification (IPC):  D06C 17/ 00( . ) D06C 23/ 04( . ) D06Q 1/ 08( . ) D06B 11/ 00( . ) D06Q 1/ 06( . ) (86) International application number: PCT/GB1991/001437 (87) International publication number: WO 1992/003607 (05.03.1992 Gazette 1992/06)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 27.08.1990 NZ 19610002350 (71) Applicant: WATSON, Julian, Mark Leeston, Canterbury (NZ)	(72) Inventors: WATSON, Julian Mark Leeston, Canterbury (NZ) McFARLANE, Ian Duncan Leeston, Canterbury (NZ) RADFORD, Edward Charles R D 4, Prebbbleton, Christchurch (NZ) (74) Representative: Wharton, Peter Robert  Urquhart-Dykes & Lord Inventions House Valley Court, Canal Road Bradford BD1 4SP Bradford BD1 4SP (GB)