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circuit breaker and a small reciprocating electro-magnetic engine. Having left the medical field, he worked as a patent examiner from 1841 to 1852 and from 1861 until his death. During that period, he also served as a professor at Columbian College (George Washington University)...

www.invent.org/hall_of_fame/1_1_6_detail.asp?vInventorID=291

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