character: Thomas Edison
topic: Development of the Phonograph
grade: 10
subject: Physics
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character: Alexander Graham Bell
topic: Innovations in Sound Transmission
grade: 10
subject: Physics
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character: Emile Berliner
topic: Invention of the Gramophone
grade: 10
subject: Physics
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character: Nikola Tesla
topic: Contributions to Electrical Engineering
grade: 10
subject: Physics
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