character: Thomas Jefferson
topic: Patent Office Staff, Overview of Patent Procedures in the 1870s
grade: 9
subject: Physics
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character: Alexander Graham Bell
topic: Impact of Inventions on Patent Procedures
grade: 9
subject: Physics
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character: Elisha Otis
topic: Innovations and the Growth of Patent Office in the 1870s
grade: 9
subject: Physics
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character: Charles Goodyear
topic: Rubber Patents and Industrial Growth in the 19th Century
grade: 9
subject: Physics
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