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Patents for R. T. Spencer
Patents 1 - 3 of 3
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PictureNumberDatePatenteeTitle
614,348Nov. 15, 1898F.P. RosbackMachine for making box-blanks
RE11,733Apr. 11, 1899L.L. FilstrupSaw-sharpening machine
628,655Jul. 11, 1899L.L. FilstrupSaw-sharpening machine
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