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| Number | Title | Issue Date |
| 4363933 | Automatic navigation station identifier and monitor This invention relates to a method and apparatus for automatically decoding and monitoring Morse code identifying call letters of radio navigation aids commonly in use for both aircraft and marine transportation, e.g. VOR--very high frequency omni range, ... | 12/14/1982 |
| 4197501 | System for reception of frequency modulated digital communication signals A system for the reception of digital communication signals which are impressed in the form of a frequency modulation upon a carrier such that they are reflection free and can be used particularly for mobile stations, long distance traffic and scatter bea... | 04/08/1980 |
