character: Alexander Graham Bell
topic: Invention of the Telephone
grade: 9
subject: Physics
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character: Thomas Edison
topic: Impact of Inventions on Communication
grade: 9
subject: Physics
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character: Nikola Tesla
topic: Alternating Current and its Role in Telecommunications
grade: 9
subject: Physics
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character: Marconi
topic: Development of Radio Communication
grade: 9
subject: Physics
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