All Patents in class 409/52


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All Patents in class 409/52
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	431,139	Jul. 01, 1890	W. Curtiss	Machine for dressing the teeth of gear-wheels
	645,427	Mar. 13, 1900	E. Polanowski	Machine for Milling Cone Screw Wheels