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Patents for G. O. Trowbridge
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
118,552Aug. 29, 1871H. PitcherImprovement in Augershollow bits
125,076Mar. 26, 1872H. PitcherImprovement in Augersauger bits
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