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

John M. Mullins

E - Fixed Constructions – 21 – B

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Auger with rotatable cutters

E - Fixed Constructions – 21 – B
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Non-rotating stabilizer for drill string

E - Fixed Constructions – 21 – B
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Opposed button thrust surfaces for earth boring bit

E - Fixed Constructions – 21 – B
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Rock bit with improved shirttail ventilation

E - Fixed Constructions – 21 – B
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Profile ID: LFCA-PAI-P-951184

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