character: Alexander Graham Bell
topic: Innovations in Sound Transmission
grade: 10
subject: Physics
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character: Hedy Lamarr
topic: Frequency-Hopping Spread Spectrum Technology
grade: 10
subject: Physics
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character: Thomas Edison
topic: The Phonograph and Sound Recording
grade: 10
subject: Physics
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character: Nikola Tesla
topic: Wireless Communication and Transmission
grade: 10
subject: Physics
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