4. Boring or penetrating the earth
  5. With tool shaft detail
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Latching bit sub

Boring or penetrating the earth – With tool shaft detail
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Liquid-filled collar for tool string

Boring or penetrating the earth – With tool shaft detail
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Lock device for hollow stem augers

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Lockable drill steel and chuck assembly

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Locking device

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Locking swivel apparatus with a supplemental internal...

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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