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All Patents in class 137/613
Patents 1 - 4 of 4
First set of recordsLast set of records
30,485Oct. 23, 1860J.F. LetellierSteam Valvesteam engine valves
402,749May 07, 1889S. LawsonGas Enginegas engines
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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