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All Patents in class 172/502
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	54,224	Apr. 24, 1866	G. Simonson	Steam Plow
	263,279	Aug. 22, 1882	T.T. Woodruff	Steam Plow
	2,228,723	Jan. 14, 1941	G. Large	Plow

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