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Patents for David O. Prince
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	402,079	Apr. 23, 1889	W.A. Dromgold, S.N. Hench	Spring-tooth harrow
	419,990	Jan. 21, 1890	W.A. Dromgold, S.N. Hench	Spring-tooth harrow

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