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All Patents in class 172/257
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,373,852	Apr. 05, 1921	C.J. Allen	Tractor
	1,776,408	Sep. 23, 1930	P.R. Thompson, W.I. Ball	Hitch Mechanism for Tractors

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