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All Patents in class 234/100
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
409,324	Aug. 20, 1889	C.C. Hill	Perforating-stamp	office worker
433,003	Jul. 29, 1890	C.C. Hill	Perforating-stamp	office worker
486,858	Nov. 29, 1892	B.F. Cummins	Perforating-stamp	office worker

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