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All Patents in class 172/421
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	134,540	Jan. 07, 1873	G.A. Groves	Gang-Plows
	359,125	Mar. 08, 1887	J.G. Cockshutt, E.H. Bond	Riding-plow
	472,302	Apr. 05, 1892	J.H. Linebarger	Plow
	838,478	Dec. 11, 1906	M.J. Todd	Road-Scarifer

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