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

Wellhead closure

E - Fixed Constructions – 21 – B

Patent

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Details

166/67, 166/51.6

E21B 33/128 (2006.01)

Patent

CA 737742

Newman Nicholas B.

E - Fixed Constructions – 21 – B
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Otteman Lloyd G.

E - Fixed Constructions – 21 – B
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G - Physics – 21 – G
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Shell Oil Company

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