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All Patents in class 451/470
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
2,240,440Apr. 29, 1941J.H. HoernApparatus for Honing Internal Screw Threadshoning machines
2,419,136Apr. 15, 1947A.F. HastyHoning Mandrelhoning machines
2,713,758Jul. 26, 1955C.F. NorkusBoring Barsmetalworking machines
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