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All Patents in class 318/480
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	280,426	Jul. 03, 1883	W. Wheeler	Focus Regulator for Electric Arc Lamps
	1,891,777	Dec. 20, 1932	A.G. Plimmer	Grinding Machine
	2,710,934	Jun. 14, 1955	J.A. Senn	Motor Controlled Machine Tool Positioning Mechanism

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