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Patents for Powell Macy
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
270,744Jan. 16, 1883W.A. ClarkeCut-off valvesteam safety valves
272,648Feb. 20, 1883W.A. ClarkeReversing-gear for steam-enginessteam engines
278,223May 22, 1883W.A. ClarkeWater-gagegauges
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