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| Patents for National Broach & Machine Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,989,652 | Jan. 29, 1935 | R.S. Drummond | Method for finishing internal gears | gear making machines | |
| 2,273,399 | Feb. 17, 1942 | C.B. De Vlieg | Machine tool | milling machines | |
| 2,292,647 | Aug. 11, 1942 | M.B. Mentley | Cutter Holder | gear cutting tools | |
| 2,906,177 | Sep. 29, 1959 | T.S. Gates, R.M. Williams | Gear Finishing | gear making machines | |