All Patents in class 137/169


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All Patents in class 137/169
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	6,252X	Nov. 17, 1830	J.S. Williams	Mode of supplying water for boilers for steam engines
	22,284	Dec. 14, 1858	J. Frick	Feed-water and blow-off apparatus for steam-boilers