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Fil:Heroes of the telegraph (IA cu31924031222494).pdf

Heroes of the telegraph - Charles Wheatstone.jpg...

Fil:Heroes of the telegraph (IA cu31924031222494).djvu

Heroes of the telegraph ( ) Author Munro, John, 1849-1930 Title Heroes of the telegraph Publisher London, The Religious tract society Description The...

Fil:Heroes of the telegraph - The Phonograph.jpg

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Fil:Heroes of the telegraph - Charles Wheatstone.jpg

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Fil:Heroes of the telegraph - Samuel Morse.jpg

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Fil:Heroes of the telegraph - William Thomson.jpg

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Fil:Heroes of the telegraph - Johann Philipp Reis.jpg

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Fil:Heroes of the telegraph - David Edwin Hughes.jpg

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Fil:Heroes of the telegraph - Charles William Siemens.jpg

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Fil:Heroes of the telegraph - Thomas Alva Edison.jpg

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