character: Nikola Tesla
topic: Intellectual Property and Technological Advancements
grade: 9
subject: Physics
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character: Thomas Edison
topic: AC vs. DC Current Debate
grade: 9
subject: Physics
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character: Alexander Graham Bell
topic: Inventions and Patent Controversies
grade: 9
subject: Physics
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character: George Westinghouse
topic: Electricity Distribution and Patent Wars
grade: 9
subject: Physics
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