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Patents for William G. Johnston
Patents 1 - 2 of 2
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PictureNumberDatePatenteeTitle
  7,039XMay 03, 1832W.G. JohnstonUniversal mill for grinding paint, dye-stuffs, etc.
8,432XOct. 04, 1834W.G. JohnstonHorse Power, Inclined Plane
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