(19)

(11)

EP 1 738 059 A1

(12)

(43) Date of publication: 03.01.2007 Bulletin 2007/01 (21) Application number: 05714233.3 (22) Date of filing: 15.03.2005

(51) International Patent Classification (IPC):  E21C 35/18(2006.01) (86) International application number: PCT/AU2005/000360 (87) International publication number: WO 2005/088073 (22.09.2005 Gazette 2005/38)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 15.03.2004 AU 2004901305 (71) Applicant: Digga Australia Pty Ltd Yatala, Queensland 4207 (AU)	(72) Inventor: WRIGHT, Stewart, James North Sanctuary Cove, QLD 4000 (AU) (74) Representative: Koepe, Gerd L.  Koepe & Partner Robert-Koch-Strasse 1 80538 München 80538 München (DE)