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

Well tools

E - Fixed Constructions – 21 – B

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166/66

E21B 33/128 (2006.01)

Patent

CA 588140

Bostock James H.

E - Fixed Constructions – 21 – B
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Schramm Harry B.

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G - Physics – 21 – G
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Otis Engineering Corporation

E - Fixed Constructions – 21 – B
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