4. Boring or penetrating the earth
  5. With means to simultaneously feed and rotate tool from a...
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Method for using a top drive with an air lift thread...

Boring or penetrating the earth – With means to simultaneously feed and rotate tool from a...
Reexamination Certificate

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Mobile drilling apparatus

Boring or penetrating the earth – With means to simultaneously feed and rotate tool from a...
Reexamination Certificate

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Motor driven drilling or chipping device

Boring or penetrating the earth – With means to simultaneously feed and rotate tool from a... – Constant rotation rate permitted regardless of change in...
Patent

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Multi-seal for top drive shaft

Boring or penetrating the earth – With means to simultaneously feed and rotate tool from a...
Reexamination Certificate

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