Morse Code Keys
These were the first digital communications devices. Morse code was invented by Samuel Morse and first used in 1844. This is a very efficient encoding, using the fewest bits for the most frequent characters, for instance "E" and "T" use one bit. The most bits used are 4 for letters and 5 for numbers, compared to the modern encoding using 8 bits for all characters. Morse code was a required proficiency to receive an amateur radio licence in the US until 2007.
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