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| All Patents in class 137/625.61 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,994,304 | Aug. 01, 1961 | W. Shultz | Hydraulic Servo Drive System for Machine Tool Elements and the Like | hydraulic apparatus | |
| 3,017,863 | Jan. 23, 1962 | N.V. Gusching, W.H. Ulman | Electrical control system | ||