character: Thomas Jefferson
topic: Overview of Patent Procedures in the 1870s
grade: 9
subject: Physics
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character: Patent Office Staff
topic: Patent Procedures in the 1870s
grade: 9
subject: Physics
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character: Thomas Jefferson
topic: Impact of Early Patent Laws
grade: 9
subject: Physics
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character: Patent Office Staff
topic: Evolution of Patent Procedures from 1790s to 1870s
grade: 9
subject: Physics
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