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Patents for D. R. Cowl
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
168,567Oct. 11, 1875S. HolbrookRailway Track-Gagetrack gauges
177,702May 23, 1876R. EnderTailor's Measurespecial purpose gauges
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