character: Alexander Graham Bell
topic: Invention of the Telephone
grade: 4
subject: Social Studies
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character: Alexander Graham Bell
topic: Improvements in Communication
grade: 4
subject: Social Studies
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character: Thomas Edison
topic: Impact of Inventions on Communication
grade: 4
subject: Social Studies
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character: Guglielmo Marconi
topic: Early Wireless Communication Technologies
grade: 4
subject: Social Studies
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