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All Patents in class 340/681
Patents 1 - 3 of 3
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PictureNumberDatePatenteeTitle
  286,273Oct. 09, 1883P.B. DelanyElectrical Synchronous Movement
  286,274Oct. 09, 1883P.B. DelanyElectrical Synchronous Movement
  286,276Oct. 09, 1883P.B. DelanyElectrical Synchronous Movement
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