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

Rudy Roth

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Auger drilling head

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
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Method of producing artificial fossil coral

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Reexamination Certificate

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