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All Patents in class 137/625.68
Patents 1 - 4 of 4
First set of recordsLast set of records
78,933Jun. 16, 1868D. DavySteam Balanced Valvedrop hammers
332,632Dec. 15, 1885P. AmingtonPiston Valvesteam engine valve gear
669,284Mar. 05, 1901G.M. PeltonReciprocating Valvesteam valves
2,365,748Dec. 26, 1944F.W. CurtisHydraulic Circuitmilling machines
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