4. Boring or penetrating the earth
  5. With means to simultaneously feed and rotate tool from a...
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Tool for installing a pipeline under a structure

Boring or penetrating the earth – With means to simultaneously feed and rotate tool from a... – Rotary drive for relatively advancing feed screw
Patent

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Top drive drilling apparatus with improved wrench assembly

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

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