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All Patents in class 137/509
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
27,704Apr. 03, 1860F. DouglasImproved steam-trapsteam engines
881,848Mar. 10, 1908G.W. DayWater Relief Valvewater valves
1,693,109Nov. 27, 1928W. ErnstSemiautomatic Valve hydraulic valves
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