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2:16
techtarget.com
What is the telegraph and how does it work?
A telegraph sends information by making/breaking electrical connections using Morse code encoding. Learn how it led directly to modern communication methods.
Feb 3, 2022
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TV Telegraph Book
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How Did the Telegraph Start a Revolution in Modern Communication?
thoughtco.com
Apr 2, 2019
Morse Code & Telegraph: Invention & Samuel Morse - HISTORY
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