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Patents for David Hitchcock
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
3,428XDec. 29, 1821D. HitchcockCast iron ploughplows
3,726XJul. 16, 1823D. HitchcockPloughplows
6,582XJun. 13, 1831D. HitchcockCornshelling machinecorn shellers
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