Patents for David R. Pratt


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Patents for David R. Pratt
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
98,628	Jan. 04, 1870	D.R. Pratt	Improvement in sawing-machines	drag saws
146,021	Dec. 30, 1873	D.R. Pratt	Improvement in sawing-machines	drag saws