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

Gary Portwood

E - Fixed Constructions – 21 – B

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Inventor

Country: United States Of America

Bowed out chisel insert for rock bits

E - Fixed Constructions – 21 – B
Patent

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Conical inserts for rolling cone rock bits

E - Fixed Constructions – 21 – B
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Core cutting rock bit

E - Fixed Constructions – 21 – B
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Drill bit and cutting inserts for hard/abrasive formations

E - Fixed Constructions – 21 – B
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Drill bit with ridge cutting cutter elements

E - Fixed Constructions – 21 – B
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Profile ID: LFCA-PAI-P-1449688

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