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

Well swab cup

E - Fixed Constructions – 21 – B

Patent

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166/56

E21B 37/10 (2006.01)

Patent

CA 885821

Henry W. Blackwell

E - Fixed Constructions – 21 – B
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Norman W. Read

E - Fixed Constructions – 21 – B
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Dresser Industries

E - Fixed Constructions – 21 – B
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Na

G - Physics – 21 – G
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