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Patents for David Heer
Patents 1 - 3 of 3
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PictureNumberDatePatenteeTitle
141,347Jul. 29, 1873D. HeerImprovement in lathes
  174,238Feb. 29, 1876D. HeerDriving Pulley
RE7,535Feb. 27, 1877D. HeerSpiral-cutting lathe
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