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| Patents for Larkin R. Williamson | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,824,700 | Sep. 22, 1931 | L.R. Williamson | Hydraulically operated reversing mechanism | tapping machines | |
| 1,825,986 | Oct. 06, 1931 | L.R. Williamson | Hydraulic column clamp | drill presses | |
| 1,999,225 | Apr. 30, 1935 | L.R. Williamson | Interlocked Electric Traverse and Hydraulic Clamp for Mobile Drills | metalworking machine mechanisms | |
| 2,257,771 | Oct. 07, 1941 | L.R. Williamson | Brake | metalworking presses | |