4. Pipes and tubular conduits
  5. Plural duct
  6. With spacer and encircling element

Walker-Neer Mfg. Co., Inc.

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Collapsible pedestal for drilling apparatus

Tool driving or impacting – Advance causing or controlling means
Patent

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Inner tube assembly for dual conduit drill pipe

Pipes and tubular conduits – Plural duct – With spacer and encircling element
Patent

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Self-centering clamp for down-hole tubulars

Buckles – buttons – clasps – etc. – Strap-end-attaching devices – Buckle connected
Patent

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Stabilizer for single or dual tube drilling

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent

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