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Vacuum boring and mud recovery system

Boring or penetrating the earth – Processes – Boring with specific fluid
Reexamination Certificate

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Vacuum excavator

Boring or penetrating the earth – Processes – Boring with specific fluid
Patent

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Vacuum feed supply system for drilling fluid additives

Boring or penetrating the earth – Processes – Boring with specific fluid
Reexamination Certificate

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Vacuum tank for use in handling oil and gas well cuttings

Boring or penetrating the earth – Processes – Boring with specific fluid
Reexamination Certificate

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Variable rake mine tool insert and method of use

Boring or penetrating the earth – Processes
Patent

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Vertical drilling method and apparatus

Boring or penetrating the earth – Processes – Boring with specific fluid
Patent

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Vibration dampened table bushing assembly for rotary drilling ma

Boring or penetrating the earth – Processes
Patent

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Vortex method

Boring or penetrating the earth – Processes – Boring with specific fluid
Patent

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