"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
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| Number | Title | Issue Date |
| 5719763 | Frequency injector motion controller A high frequency injection system overlays a textured signal onto a digital control signal for controlling a motion base. The system includes a digital motion controller and HFIS generator linked to a mixer. A mixed signal from the mixer is amplified and ... | 02/17/1998 |