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| All Patents in class 91/216R | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,027,706 | Jan. 14, 1936 | L.L. Schauer, J.H. McKewen | Counterbalance valve | drill presses | |
| 2,383,429 | Aug. 21, 1945 | G.A. Wahlmark | Hydraulically operated control mechanism | ||
| 2,656,681 | Oct. 27, 1953 | G.J. Peterson | Variable stroke power actuator | sanding machines | |
| 2,882,760 | Apr. 21, 1959 | L.A. Leifer | Infinitey Variable Incremental Feed Control | metalworking speed changing mechanisms | |