4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. With above-ground means
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Apparatus for the removal of spoil when making trenches of great

Boring or penetrating the earth – With below-ground tool drive prime mover – With above-ground means
Patent

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Borehole drilling apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – With above-ground means
Patent

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Continuous drill feed apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – With above-ground means
Patent

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Downhole drilling system

Boring or penetrating the earth – With below-ground tool drive prime mover – With above-ground means
Patent

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Downhole turbine rotary drilling device

Boring or penetrating the earth – With below-ground tool drive prime mover – With above-ground means
Patent

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Helicopter portable earth drilling apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – With above-ground means
Patent

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Two way earth boring fluid motor

Boring or penetrating the earth – With below-ground tool drive prime mover – With above-ground means
Patent

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