character: Alexander Graham Bell
topic: Development of Sound Technology
grade: 4
subject: Social Studies
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character: Thomas Edison
topic: Invention of the Phonograph
grade: 4
subject: Social Studies
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character: Guglielmo Marconi
topic: Advancements in Wireless Communication
grade: 4
subject: Social Studies
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character: Nikola Tesla
topic: Contributions to Electrical Engineering
grade: 4
subject: Social Studies
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