character: Emile Berliner
topic: Development of the Flat Disc Record and Its Impact on Phonography
grade: 11
subject: Music
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character: Thomas Edison
topic: Invention of the Phonograph and Early Recording Technologies
grade: 11
subject: Music
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character: Alexander Graham Bell
topic: Acoustical Recording Techniques and Their Evolution
grade: 11
subject: Music
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character: Gramophone Manufacturers
topic: The Rise of Commercial Phonography in the 20th Century
grade: 11
subject: Music
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