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Hammer for use in a bore hole and apparatus for use therewith

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

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Head for injecting liquid under pressure to excavate the ground

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

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High-velocity jet digging method

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

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Horizontal bore cryogenic drilling method

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

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Horizontal drilling for oil recovery

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

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Horizontal waterjet drilling method

Boring or penetrating the earth – Processes – Boring with specific fluid
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Hydraulic automatic boosting pump

Boring or penetrating the earth – Processes – Boring with specific fluid
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Hydraulic drilling apparatus and method

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

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Hydraulic drilling apparatus and method

Boring or penetrating the earth – Processes – Boring with specific fluid
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Hydraulic shock absorbing method

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