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

Subsurface valve

E - Fixed Constructions – 21 – B

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166/43

E21B 23/06 (2006.01)

Patent

CA 664332

Boer George

E - Fixed Constructions – 21 – B
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Morse Joe V.

E - Fixed Constructions – 21 – B
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Pistole Harry

E - Fixed Constructions – 21 – B
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Pitts William A.

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Jersey Production Research Company

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Na

G - Physics – 21 – G
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