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All Patents in class 172/643
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
402,079	Apr. 23, 1889	W.A. Dromgold, S.N. Hench	Spring-tooth harrow	harrows
555,699	Mar. 03, 1896	W.A. Dromgold, S.N. Hench	Harrow	harrows

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