Patents for R. H. Porter


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Patents for R. H. Porter
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
146,974	Feb. 03, 1874	F.E. Allen	Improvement in Ring Gages for Jewelers	rules
281,750	Jul. 24, 1883	H.R. Barnhurst	Saw-mill head-block	sawmill headblocks