character: Guglielmo Marconi
topic: Pioneering work in radio transmission
grade: 12
subject: Physics
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character: Nikola Tesla
topic: Contributions to the development of wireless transmission technology
grade: 12
subject: Physics
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character: Reginald Fessenden
topic: Early experiments in voice transmission over radio waves
grade: 12
subject: Physics
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character: David Sarnoff
topic: Influence on the commercial expansion of radio technology
grade: 12
subject: Physics
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