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All Patents in class 172/745
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	421,661	Feb. 18, 1890	G.S. Briggs	Plowshare
	484,758	Oct. 18, 1892	G. Sears	Plow-point
	628,431	Jul. 04, 1899	W.A. Clark	Plow-point

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