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

Oil well tools

E - Fixed Constructions – 21 – B

Patent

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166/42

E21B 23/06 (2006.01)

Patent

CA 530572

Harry B. Schramm

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Herbert C. Otis

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Lowell M. Wilhoit

E - Fixed Constructions – 21 – 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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