21. The military authorities also installed their own equipment, including two radiotelephone prototypes constructed to withstand high altitude. 22. There is some international interconnectivity, with microwave radio relay and HF radiotelephone communications to Comoros as of 2001. 23. For example, on narrow-band radiotelephones , a channel spacing of 12.5 kHz is typical. 24. The UK introduced its'System 1'manual radiotelephone service as the South Lancashire Radiophone Service in 1958. 25. On the trip he also met Lee de Forest, inventor of the wireless radiotelephone and the vacuum tube. 26. In 1945 Young began work on mobile radiotelephone systems in vehicles for coverage of urban areas and along highways. 27. Under overcast skies, the protest flotilla is being shadowed by a French naval frigate, Mills said by radiotelephone . 28. The recovery party noted that the radio was discovered tuned to 2182 kHz, the international marine radiotelephone distress channel. 29. Herrold's primary radiotelephone effort was toward developing a commercial system suitable for point-to-point service. 30. An unnumbered phone ( radiotelephone ) award is available as well for using FM, or any other voice mode.
