4. Boring or penetrating the earth
  5. Bit or bit element
  6. With fluid conduit lining or element

James E. Elam

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Cold headed center vacuum drill bit

Metal tools and implements – making – Blank or process – Drill
Patent

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Cold headed center vacuum drill bit

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

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Profile ID: LFUS-PAI-P-993206

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