(19)

(11)

EP 0 909 123 A1

(12)

(43) Date of publication: 21.04.1999 Bulletin 1999/16 (21) Application number: 97921531.0 (22) Date of filing: 23.05.1997

(51) International Patent Classification (IPC):  A01B 21/ 04( . ) (86) International application number: PCT/AU1997/000315 (87) International publication number: WO 1997/044995 (04.12.1997 Gazette 1997/52)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV RO SI (30) Priority: 27.05.1996 AU 1996PO00081 (71) Applicants: Brown, Robyn Prarie, VIC 3572 (AU) Brown, Gary John Prarie, VIC 3572 (AU)	(72) Inventor: BROWN, Gary, John Prarie, VIC 3572 (AU) (74) Representative: Bayliss, Geoffrey Cyril, et al  BOULT WADE TENNANT, 27 Furnival Street London EC4A 1PQ London EC4A 1PQ (GB)