character: Thomas Edison
topic: Improvement of Telephone Technology
grade: 9
subject: Physics
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character: Alexander Graham Bell
topic: Invention of the Telephone
grade: 9
subject: Physics
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character: Elisha Gray
topic: Competition in Telephone Technology
grade: 9
subject: Physics
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character: Guglielmo Marconi
topic: Wireless Communication Advances
grade: 9
subject: Physics
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