All Patents in class 73/506


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All Patents in class 73/506
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	749,743	Jan. 19, 1904	T.H. McQuown	Speed-indicator
	759,512	May 10, 1904	H. Frahm	Method of Measuring the Revolutions of Rotating Shafts