| 1. | During poorer radio propagation periods morse code radiotelegraphy had to be used.
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| 2. | All communication to and from Isachsen Station was via shortwave radio radiotelegraphy.
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| 3. | The earliest radio stations were simply radiotelegraphy systems and did not carry audio.
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| 4. | His brother Anders Henrik Bull is known for his studies in wireless radiotelegraphy.
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| 5. | It's use spread to ordinary telegraph lines and radiotelegraphy radio receivers.
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| 6. | Perhinek and Mihailovi maintained continuous communication trough radiotelegraphy.
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| 7. | Routine communications was by radiotelegraphy to Angmagssalik.
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| 8. | That same year he also proposed setting aerials on the Eiffel Tower for long-range radiotelegraphy.
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| 9. | The advent of radio in the early 20th century brought about radiotelegraphy and other forms of wireless telegraphy.
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| 10. | Despite the weight penalty, radiotelegraphy gradually replaced earlier message-in-a-bottle airdrops.
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