character: Thomas Edison
topic: Development of the phonograph
grade: 12
subject: History
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character: Emile Berliner
topic: Advancements in sound recording technology
grade: 12
subject: History
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character: Alexander Graham Bell
topic: Contributions to sound recording and telecommunications
grade: 12
subject: History
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character: Lee DeForest
topic: Inventing the audion and its impact on sound recording
grade: 12
subject: History
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