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All Patents in class 172/223
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	7,819X	Nov. 19, 1833	C.H. McCormick	Self-sharpening, horizontal plough
	9,210X	Oct. 28, 1835	J.W. Jordan	Inverting hill side and horizontal plough

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