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Patents Granted on 1831-03-08
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
6,409XMar. 08, 1831F. CrossImprovement on Douglass' thrashing machinethreshers or thrashers
6,410XMar. 08, 1831B. HackettBlock for stereotype platesprinter
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