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All Patents in class 172/643
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
402,079Apr. 23, 1889W.A. Dromgold, S.N. HenchSpring-tooth harrowharrows
555,699Mar. 03, 1896S.N. Hench, W.A. DromgoldHarrowharrows
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