4. Boring or penetrating the earth
  5. With means to simultaneously feed and rotate tool from a...
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Shock mounted top drive

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

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Spring actuated power swivel support rollers

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

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Stepwise rotary actuator

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

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Support system for a top driven drilling unit

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

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