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| All Patents in class 74/344 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,297,256 | Mar. 11, 1919 | A.M. Sosa, H.W. Schatz | Drilling Machine | radial drill presses | |
| 1,297,257 | Mar. 11, 1919 | H.W. Schatz | Drilling Machine | radial drill presses | |
| 1,527,247 | Feb. 24, 1925 | C. Bouillon | Electric Motor Driven Change Speed Device | ||
| 1,581,927 | Apr. 20, 1926 | G.L. Kollock | Two-speed gearing for electric drill | handheld power drills | |
| 1,905,746 | Apr. 25, 1933 | W.J. Peets | Phonograph driving mechanism | ||