4. Boring or penetrating the earth
  5. With means movable relative to tool below ground to stop...
  6. With longitudinally spaced valve seats

Bull Dog Tool Inc.

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Pump-packing device for down-hole well arrangements

Wells – Processes – Assembling well part
Patent

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Well clean out tool

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – With longitudinally spaced valve seats
Patent

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