4. Boring or penetrating the earth
  5. Means carried by housing insertable in inaccessible hole to...

Ruben C. Boyter

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Sectional drive and coupling system

Boring or penetrating the earth – With below-ground tool drive prime mover – With positive connection between tool and support shaft for...
Reexamination Certificate

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Sectional drive system

Boring or penetrating the earth – Means carried by housing insertable in inaccessible hole to...
Patent

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Sectional drive system

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

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Sectional drive system

Boring or penetrating the earth – Means carried by housing insertable in inaccessible hole to...
Patent

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Profile ID: LFUS-PAI-P-620656

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