4. Boring or penetrating the earth
  5. Bit or bit element
  6. Specific or diverse material

Diamond Products International Inc.

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Bi-center and bit method for enhancing stability

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

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Bi-center bit adapted to drill casing shoe

Metal tools and implements – making – Blank or process – Drill
Reexamination Certificate

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Bi-center bit adapted to drill casing shoe

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

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Bi-center bit with oppositely disposed cutting surfaces

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

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Coring tool

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Patent

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Profile ID: LFUS-PAI-P-743307

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