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Boring or penetrating the earth
Bit or bit element
Bit with leading portion forming smaller diameter initial bore
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Mining bit
Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent
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Multi profile performance enhancing centric bit and method...
Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Reexamination Certificate
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