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| All Patents in class 60/464 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,884,277 | Oct. 25, 1932 | B. Sassen | Self Regulating Hydraulic System | hydraulic apparatus | |
| 2,006,311 | Jun. 25, 1935 | B. Sassen, H. Ernst | Leakage Compensator for Hydraulic Systems | hydraulic apparatus | |
| 2,474,706 | Jun. 28, 1949 | G.A. Wahlmark | Hydraulic transmission | ||