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| Number | Title | Issue Date |
| 4749936 | Power transmission An electrohydraulic servo system which includes a linear actuator having a cylinder and a piston variably positioned therewithin, a servo valve responsive to valve control signals for coupling the actuator to a source of hydraulic fluid, and control elect... | 06/07/1988 |
| 3932795 | Servo control positioning apparatus including a standing wave detector Apparatus for effecting relative positioning between two mechanical members in accordance with digital (or analog) commands includes a standing wave supporting, electrical wave propagating structure terminated other than by its iterative impedance. The wa... | 01/13/1976 |
