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| All Patents in class 91/536 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,794,472 | Mar. 03, 1931 | F.H. Mussler | Hydraulic Change-Speed-Gear Mechanism | ||
| 2,286,880 | Jun. 16, 1942 | W.A. Traut | Hydraulic Control System | ||
| 2,889,755 | Jun. 09, 1959 | W. Schroeder | Machine Tool Transmission | metalworking power transmission | |