All Patents in class 137/512.1


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All Patents in class 137/512.1
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	38,444	May 05, 1863	J.W. Douglas	Improvement in pumps
	213,375	Mar. 18, 1879	H.P. Benjamin, J. Badger	Valve for Bellows
	1,428,402	Sep. 05, 1922	G.F. Steedman	Reciprocating Pump or Compressor
	1,515,474	Nov. 11, 1924	J.G. Gibson	Valve