character: Dr. Robert Brown
topic: Applications of Sound Technology in Communication
grade: 9
subject: Physics
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character: Thomas Edison
topic: Inventions in Sound Recording Technology
grade: 9
subject: Physics
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character: Alexander Graham Bell
topic: Development of the Telephone and Sound Waves
grade: 9
subject: Physics
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character: Nikola Tesla
topic: Tesla Coils and the Wireless Transmission of Sound
grade: 9
subject: Physics
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