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Patents for J. W. Downing
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
1,124,311Jan. 12, 1915C.L. MattisonBelt sanding-machinesanding machines
1,181,330May 02, 1916C.L. MattisonAbrading or polishing machinesanding machines
1,222,783Apr. 17, 1917M.W. MattisonCutter-headcutterheads
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