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All Patents in class 172/555
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	369,163	Aug. 30, 1887	G.M. Clark	Disk-harrow
	631,598	Aug. 22, 1899	M.J. Todd	Harrow
	2,221,099	Nov. 12, 1940	G. Large	Cultivator

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