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All Patents in class 122/389
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	23,320	Mar. 22, 1859	A.M. Sprague	Apparatus for Skimming of the Water in Steam-Boilers
	154,734	Sep. 01, 1874	R. Waugh	Surface Blow-Offs

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