Patents Granted on 1831-03-08


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Patents Granted on 1831-03-08
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
6,409X	Mar. 08, 1831	F. Cross	Improvement on Douglass' thrashing machine	threshers and thrashers
6,410X	Mar. 08, 1831	B. Hackett	Block for stereotype plates	printer