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Retrieval tool with slips for retrieving bottom hole...

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

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Reusable auger barrel

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

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Rotary head

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

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Securing and tensioning device for a towing cable connected to a

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

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Shaft sinking rig

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

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Water well drilling accessory, mountable on cable tool water wel

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

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Well drilling apparatus

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

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