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Patents for Charles H. Hill
Patents 1 - 3 of 3
First set of recordsLast set of records
158,172Dec. 29, 1874C.H. Hill, A.W. ProctorImprovement in machine for grinding knivescutter grinding
158,173Dec. 29, 1874C.H. Hill, A.W. ProctorImprovement in belt-shifterscutter grinding
2,074,844Mar. 23, 1937C.H. HillMetalworking Machinemetal lathe accessories
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