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All Patents in class 29/55
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
120,044Oct. 17, 1871F. CurtisImprovement in machines for making machine screwsscrew machines
RE9,086Feb. 17, 1880F. CurtisMachine for making machine-screwsscrew machines
851,742Apr. 30, 1907W.H. GatesScrew Machinescrew machines
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