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  5. Bit or bit element
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System for lubricating the bearings of cutting rollers of a roll

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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System, method and cutterhead for dry full-area drilling

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent

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System, method, and apparatus for predicting tracking by...

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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