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

Djurre Hans Zijsling

E - Fixed Constructions – 21 – B

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Inventor

Country: Netherlands

Device for controlling the weight on an earth drill bit

E - Fixed Constructions – 21 – B
Patent

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Downhole drilling motor

E - Fixed Constructions – 21 – B
Patent

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Drill bit

E - Fixed Constructions – 21 – B
Patent

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Drill bit

E - Fixed Constructions – 21 – B
Patent

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Drill bit

E - Fixed Constructions – 21 – B
Patent

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Rotary drill bit for drilling through sticky formations

E - Fixed Constructions – 21 – B
Patent

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Profile ID: LFCA-PAI-P-1147653

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