character: Thomas Edison
topic: Early Innovations in Electrical Communication
grade: 6
subject: Science
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character: Alexander Graham Bell
topic: Invention of the Telephone
grade: 6
subject: Science
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character: Nikola Tesla
topic: Alternating Current and Wireless Communication
grade: 6
subject: Science
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character: Guglielmo Marconi
topic: Development of Wireless Telegraphy
grade: 6
subject: Science
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