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Patents for John Duffus
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
150,395May 05, 1874J.C. ChapmanSlotting and Planing Toolsmetal planers
154,455Aug. 25, 1874W.H. Hoffman, J.C. ChapmanImprovement in self-oiling journal-boxes and hangersindustrial machine bearings
164,560Jun. 15, 1875W.H. HoffmanImprovement in mechanisms for adjusting lathe-beds to different heightsmetal lathes
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