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| Patents for William A. Barr | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,103,784 | Jul. 14, 1914 | G.O. Leopold | Change-speed mechanism | drill presses | |
| 1,169,657 | Jan. 25, 1916 | G.O. Leopold | Drill | drill presses | |
| 1,236,848 | Aug. 14, 1917 | G.O. Leopold | Alternate driving means for the North Bros. 1445 drill | hand drills | |