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All Patents in class 251/174
Patents 1 - 3 of 3
First set of recordsLast set of records
PictureNumberDatePatenteeTitle
  1,111,399Sep. 22, 1914A.W. MorseValve
  1,354,966Oct. 05, 1920J.C. GlennEngine Valve Mechanism
  1,983,803Dec. 11, 1934H.G. MuellerSteam Engine Valve
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