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Patents for National Broach & Machine Co.
Patents 1 - 4 of 4
First set of recordsLast set of records
PictureNumberDatePatenteeTitle
1,989,652Jan. 29, 1935R.S. DrummondMethod for finishing internal gears
2,273,399Feb. 17, 1942C.B. De VliegMachine tool
  2,292,647Aug. 11, 1942M.B. MentleyCutter Holder
  2,906,177Sep. 29, 1959R.M. Williams, T.S. GatesGear Finishing
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