ANSWERS: 1
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The Synchronous Multiplex Railway Telegraph was invented in 1887 by Granville T. Woods, one of the first prominent African-American engineers. It was designed both to facilitate communications between trains and stations and to avert accidents by helping to ensuring that the location of each train was known at all times.
Source:
gloryworks.net: Granville T. Woods
todaysengineer.org: African American Heritage in Engineering
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