character: Nikola Tesla
topic: AC Power and Communication
grade: 8
subject: History
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character: Thomas Edison
topic: DC Power and the Electrical Wars
grade: 8
subject: History
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character: Guglielmo Marconi
topic: Early Wireless Communication Innovations
grade: 8
subject: History
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character: George Westinghouse
topic: Promoting AC Power Systems
grade: 8
subject: History
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