Everyone can learn something new from this excellent book.
If your new to Teletype and Telegraphy then read through this excellent book.
NAVSHIPS 0967-255-0010 (principles of telegraphy - teletypewriter) courtesy
https://www.navy-radio.com/
https://navy-radio.com/manuals/tty/Principles_of_Telegraphy.pdf
Daniel
K6YIC
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