character: George Westinghouse
topic: Inventions in Transportation
grade: 2
subject: History
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character: George Westinghouse
topic: Air Brake Invention
grade: 2
subject: History
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character: George Westinghouse
topic: Railroad Innovations
grade: 2
subject: History
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character: George Westinghouse
topic: Electric Railway Systems
grade: 2
subject: History
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