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All Patents in class 137/454.4
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
1,219,511Mar. 20, 1917C.W. WeissAir Compressorair compressors
1,708,158Apr. 09, 1929E.H. StedmanValve structure for compressorsair compressors
1,890,051Dec. 06, 1932H.A. GehresValve Mechanisminternal combustion engine valves
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