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Illustration of Morse telegraphy developed in 1835, principle of electrical signal transmission and
BRK26B84_224

Illustration of Morse telegraphy developed in 1835...

Morse device with Morse key
BRK20A30_043

Morse device with Morse key

Morse device with Morse key
BRK20A30_245

Morse device with Morse key

Telegraph key is a switching device used primarily to send Morse code
BRK19E01_146

Telegraph key is a switching device used primarily...