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Patents for Halladay, Litchfield & Co.
Patents 1 - 5 of 5
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PictureNumberDatePatenteeTitle
172,092Jan. 11, 1876W.L. CovelImprovement in saw-sharpening machines
  222,386Dec. 09, 1879W.L. CovelImprovement in saw-sharpening machines
254,869Mar. 14, 1882W.H. HalladaySaw-sharpening machine
CA-15,491Sep. 19, 1882W.H. HalladayImprovements on automatic saw-sharpeners
RE10,252Dec. 05, 1882W.L. CovelSaw-sharpening
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