4. Boring or penetrating the earth
  5. With self-acting cyclic advance and retraction of tool or...
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Downhole tool

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...
Reexamination Certificate

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Drilling apparatus and method for introducing a drilling...

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...
Reexamination Certificate

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Drilling system with expandable sleeve

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...
Reexamination Certificate

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Dual tractor drilling system

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...
Reexamination Certificate

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