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All Patents in class 137/625.31
Patents 1 - 5 of 5
First set of recordsLast set of records
443,107Dec. 23, 1890F.C. OlinBalanced Govenor Valve
519,639May 08, 1894E.S. MatthewsHydraulic valve
533,388Jan. 29, 1895H. BolthoffRegister-valvesteam valves
2,912,011Nov. 10, 1959F.G. BurgValve structuredrill presses
3,067,768Dec. 11, 1962J.L. BurgTemperature compensated hydraulic control devicedrill presses
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