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John D. Barr

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Drag bit and cutters

E - Fixed Constructions – 21 – B
Patent

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Drill bit

E - Fixed Constructions – 21 – B
Patent

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Drill bit and cutter therefor

B - Operations – Transporting – 23 – B
Patent

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Drill bit manufacturing method

B - Operations – Transporting – 23 – P
Patent

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Drilling system and method for controlling the direction of...

E - Fixed Constructions – 21 – B
Patent

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Drill bit manufacturing method

B - Operations – Transporting – 23 – P
Patent

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Drilling system and method for controlling the direction of...

E - Fixed Constructions – 21 – B
Patent

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Improvements in or relating to steerable rotary drilling...

E - Fixed Constructions – 21 – B
Patent

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Manufacture of rotary drill bits

E - Fixed Constructions – 21 – B
Patent

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Rotary drill bits

E - Fixed Constructions – 21 – B
Patent

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Profile ID: LFCA-PAI-P-587147

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