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A down-the-hole hammer
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An attachment for percussion drill tools
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A drill bit assembly for fluid-operated percussion drill tools
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A drill bit assembly for fluid-operated percussion drill tools
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A drill bit assembly for fluid-operated percussion drill tools
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A percussion hammer for enlarging drilled holes
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A reverse circulation down-the-hole drill
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Valveless down-the-hole drill
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Reverse circulation down-the-hole hammer drill and bit therefor
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Improvements to a percussion drilling device.
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