4. Boring or penetrating the earth
  5. Bit or bit element
  6. Bit with leading portion forming smaller diameter initial bore
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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

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 assembly

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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Bi-centered drill bit having enhanced casing drill-out...

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-centered drill bit having improved drilling stability mud...

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-centered drill bit having improved drilling stability,...

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

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Bit assembly

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

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Boring head method and boring head for a ground boring device

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

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