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All Patents of Type: parallel rules
Patents 1 - 5 of 5
First set of recordsLast set of records
453XMay 17, 1803J.J. HawkinsPentegraph and parallel rulerparallel rules
85,708Jan. 05, 1869F.A. TrautImprovement in Parallel Rulesparallel rules
224,962Feb. 24, 1880C.D. SigsbeeParallel Rulerparallel rules
407,350Jul. 23, 1889J.J. HamiltonParallel Rulerparallel rules
433,264Jul. 29, 1890J.R. AndersonParallel Rulerparallel rules
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