4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
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Ball and socket mounted hydraulic posthole digger and method for

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical...
Patent

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Bearing assembly inner barrel and well drilling equipment...

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Reexamination Certificate

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Bearing assembly retaining apparatus and well drilling...

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Reexamination Certificate

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Bits for use in drilling with casting and method of making...

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate

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