All Patents in class 74/3.2


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All Patents in class 74/3.2
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	23,521	Apr. 05, 1859	D.A. Woodbury	Variable cut-off for steam-engines
	27,431	Mar. 13, 1860	A. Crosby	Induction-valve gear for steam-engines
	430,528	Jun. 17, 1890	W.O. Knowlson	Valve Gear for Engines