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| Patents for Roy G. Mumma | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,391,639 | Sep. 20, 1921 | V.R. Koontz | Collapsible tap | taps and dies | |
| 1,394,845 | Oct. 25, 1921 | V.R. Koontz | Die-head | taps and dies | |
| 1,456,805 | May 29, 1923 | V.R. Koontz | Die head | taps and dies | |