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

Valve operator

E - Fixed Constructions – 21 – B

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Details

137/117, 166/46

E21B 43/12 (2006.01)

Patent

CA 869352

Fowler John H.

E - Fixed Constructions – 21 – B
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Johnson Charles F.

E - Fixed Constructions – 21 – B
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G - Physics – 21 – G
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Rockwell Manufacturing Company

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