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All Patents in class 234/100
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
409,324Aug. 20, 1889C.C. HillPerforating-stampoffice worker
433,003Jul. 29, 1890C.C. HillPerforating-stampoffice worker
486,858Nov. 29, 1892B.F. CumminsPerforating-stampoffice worker
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