4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. With positive connection between tool and support shaft for...
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Method and apparatus for drilling boreholes in earth formations

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

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Method and apparatus for drilling boreholes in earth...

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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Method and apparatus for drilling in permafrost and the like

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

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