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All Patents in class 74/561
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	229,614	Jul. 06, 1880	W.A. Johnson	Treadle Mechanism for Dental Engine
	422,465	Mar. 04, 1890	F. Thomas	Treadle for Foot Lathes
	3,210,712	Oct. 05, 1965	J.R. Goff	Foot operated potentiometer and switch

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