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| Patents for National Broach & Machine Co., Inc. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,989,651 | Jan. 29, 1935 | R.S. Drummond | Method of finishing gears | |
 | 1,989,652 | Jan. 29, 1935 | R.S. Drummond | Method for finishing internal gears | |
 | 2,111,045 | Mar. 15, 1938 | R.S. Drummond | Lapping machine | |
 | 2,273,399 | Feb. 17, 1942 | C.B. De Vlieg | Machine tool | |