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WO2007062490A1
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Fluid flow control means for a reverse circulation down hole hammer
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WO2006032093A1
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Piston design for down hole hammer
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AU2003900935A0
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A drive means
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AU2002366651A1
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A percussive downhole hammer and piston design for such a hammer
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WO03050378A1
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A percussive downhole hammer and piston design for such a hammer
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AUPR879901A0
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An improved transmission sleeve
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AUPP482398A0
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Concave radius on hammer piston
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AU8004398A
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A drill bit with drive and retainer means
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AU8004498A
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A drill bit
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AU7513398A
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A percussive hammer drill
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AUPO928597A0
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Lubrication arrangement for air hammer pistons
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AUPO836697A0
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Improved port location for air hammers
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WO9805476A1
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Forwardly located bit retention means
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AU3613697A
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Forwardly located bit retention means
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AUPO737497A0
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Drill bit with drive and retaining means located forwardly of hammer barrel
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AUPO716997A0
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Improvements to forwardly located bit retention means
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AUPO698197A0
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A percussive hammer drill
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AUPO688597A0
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A bit drive means with drive face inserts
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AUPO513897A0
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Improved bit drive means
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AUPO513997A0
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Cluster drilling arrangement
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