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All Patents of Type: graduated rules
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
73,082Jan. 07, 1868S. DarlingStraight Edgegraduated rules
463,212Nov. 17, 1891A.C. FowlerCombination Rule, Square, and Circle-Markergraduated rules
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