4. Boring or penetrating the earth
  5. Bit or bit element
  6. Specific or diverse material

Walker-Neer Manufacturing Co. Inc.

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Air injection sub

Pumps – One fluid pumped by contact or entrainment with another – Jet
Patent

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Apparatus for supporting and rotating a down hole tubular

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Automatic pipe elevator

Handling: hand and hoist-line implements – Grapple – Pivoted jaws
Patent

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Axial return hammer

Boring or penetrating the earth – Processes – Boring with specific fluid
Patent

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Bit packer for dual tube drilling

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Profile ID: LFUS-PAI-P-1561805

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