character: Reginald Fessenden
topic: Early experiments in voice transmission over radio waves
grade: 12
subject: Physics
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character: Guglielmo Marconi
topic: Development of wireless telegraphy and radio communication
grade: 12
subject: Physics
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character: Thomas Edison
topic: Contributions to the invention of sound recording technology
grade: 12
subject: Physics
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character: Nikola Tesla
topic: Advancements in wireless communication systems
grade: 12
subject: Physics
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