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| All Patents in class 192/3.51 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,339,604 | Jan. 18, 1944 | R.H. McClellan, C.E. Linden | Hydraulic gear shifting and driving system | |
| 2,815,834 | Dec. 10, 1957 | A.W. Mall | Portable power tool drive mechanism | ||
| 3,117,658 | Jan. 14, 1964 | C.L. Schulte, K.G. Byar, W.G. Hoelscher | Hydraulically Operated Transmission System | ||