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Patents for Rufus L. Howard
Patents 1 - 3 of 3
First set of recordsLast set of records
156,066Oct. 20, 1874E. SchlenkerImprovement in visesbench vises
162,194Apr. 20, 1875E. SchlenkerImprovement in bolt-threading machinesmetal threading machines
166,730Aug. 17, 1875E. SchlenkerImprovement in hoisting-machines or elevatorselevators and lifts
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