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April 1, 2024
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Actualizado 3 dic 2018
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javier del rio tarque
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Eventos
Graham Bell´s birth
Advances on the research for THE HARMONIC TELEGRAPH
FIRST CALL OF THE HISTORY
Bell patented The Telephone
PAY PHONE PATENT
TELEPHONE'S IDEA SET ON BELL'S MIND
Períodos
Researching of a MULTIPLE TELEGRAPH
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