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Patents for D. O. Barnell
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
706,095Aug. 05, 1902E. OehrleCombination Square and Protractorsquares
798,695Sep. 05, 1905E. OehrleCombination Square and Protractorprotractors
820,311May 08, 1906E. OehrleSquare and Levelsquares
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