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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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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Stabilization devices for drill motors

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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Swivel/tilting bit crown for earth-boring drills

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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Swivel/tilting bit crown for earth-boring drills

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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