All Patents in class 91/257


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All Patents in class 91/257
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	23,737	Apr. 19, 1859	D.A. Woodbury	Variable cut-off gear for steam-engines
	69,232	Sep. 24, 1867	J. McConnell	Rotary Steam Valve
	449,504	Mar. 31, 1891	J.E. Waterous	Valve for steam-engines