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TELEGRAPHONE: MAGNETIC RECORDING TELE PHONE INVENTED BY…
TELEGRAPHONE: magnetic recording tele phone invented by Valdemar Poulsen (1869-1942). He applied for a patent on 1 December 1898; and the instrument aroused great interest at the Paris Exposition of 1900. RIBBON TELEGRAPHONE: Diagrams of the wire telegraphone which could record magnetically for one minute using piano wire. (KEYSTONE/World History Archive/)
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KEYSTONE
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World History Archive WHA
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