4. E - Fixed Constructions
  5. 21
  6. B

George E. Dolezal

E - Fixed Constructions – 21 – B

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Country: United States Of America

Air groove scraper

E - Fixed Constructions – 21 – B
Patent

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Centrifugal water-air separation in earth drilling bits

E - Fixed Constructions – 21 – B
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Drill bit with seal ring compensator

E - Fixed Constructions – 21 – B
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Solid head bit with tungsten carbide central core

E - Fixed Constructions – 21 – B
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Profile ID: LFCA-PAI-P-303441

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