"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 |
| 4979137 | Air traffic control training system An air traffic control training system and method for interacting with a user, the system and method generating a representation of at least one moving aircraft having an initial position and heading for producing a dynamic simulation of an air traffic sc... | 12/18/1990 |