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| All Patents in class 91/417R | |||||
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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 | |
| 3,052,262 | Sep. 04, 1962 | W.L. McCann | Power Actuated Multiple Valve | hydraulic apparatus | |