A morse key for an electrical telegraph machine. From a British post office and in use in the 19th to 20th century. (Science Museum, London)
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APA Style
London, S. M. (2023, March 22). Telegraph Morse Key. World History Encyclopedia. https://www.worldhistory.org/image/17222/telegraph-morse-key/
Chicago Style
London, Science Museum,. "Telegraph Morse Key." World History Encyclopedia, March 22, 2023. https://www.worldhistory.org/image/17222/telegraph-morse-key/.
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London, Science Museum,. "Telegraph Morse Key." World History Encyclopedia, 22 Mar 2023, https://www.worldhistory.org/image/17222/telegraph-morse-key/.