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

Inc. Norton Christensen

E - Fixed Constructions – 21 – B

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Country: Afghanistan

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Apparatus for transmitting data from a borehole to the...

E - Fixed Constructions – 21 – B
Patent

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Auxiliary controlled valve disposed in a drilling string

E - Fixed Constructions – 21 – B
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Compensation device for insertion in a drill string for...

E - Fixed Constructions – 21 – B
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Coring device with an improved core sleeve and anti-...

E - Fixed Constructions – 21 – B
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Coring device with an improved core sleeve and anti-...

E - Fixed Constructions – 21 – B
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