All Patents in class 15/308


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All Patents in class 15/308
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,581,774	Apr. 20, 1926	E.W. Zeh	Tile cleaning and stacking machine and method
	1,792,570	Feb. 17, 1931	A.A. Breuer	Blackboard-eraser cleaner
	1,945,274	Jan. 30, 1934	A. Hormel	Metal plate cleaning machine