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All Patents in class 172/547
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	9,602X	Apr. 21, 1836	J.C. Concklin	Harrow
	79,540	Jul. 07, 1868	J. Armstrong	Rotary Harrow
	500,253	Jun. 27, 1893	F. Syvrnd, A. Johnson	Revolving Harrow

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