Chicago FD updates radio signatures (part 2)

 

These images showcase historical radio telegraph identification numbers from a series labeled as A-04-15-5, A-04-15-6, and A-04-15-7. They appear to be part of a collection or documentation related to early radio communication systems, possibly used for identifying stations or operators during the era when Morse code was widely used. The numbers may have been assigned by regulatory bodies to ensure proper identification and control of transmissions.

Such identification numbers were crucial in preventing interference and maintaining order in the growing field of wireless communication. These documents could be valuable for historians, radio enthusiasts, or researchers studying the evolution of telecommunications. Each image likely represents a different set of codes or station assignments, reflecting the structured approach taken to manage radio traffic in the past.

If you're interested in learning more about how these systems worked or their significance in modern communication, feel free to ask. There's a lot to explore in the history of radio and telegraphy!

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