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Device for cutting, drilling or similar working of rock, ore, co

Boring or penetrating the earth – Miscellaneous
Patent

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Device for making a hole in the ground

Boring or penetrating the earth – Miscellaneous
Patent

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Directional boring drill bit blade

Boring or penetrating the earth – Miscellaneous
Patent

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Divergent fluid nozzle for drilling tool

Boring or penetrating the earth – Miscellaneous
Patent

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Downhole jet unit for testing and completing wells

Boring or penetrating the earth – Miscellaneous
Reexamination Certificate

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