ANSWERS: 1
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A 19th Century African American inventor named Osbourn Dorsey invented the door stop on December 10, 1878. Dorsey also invented a device to hold a door closed, this door holding device is known today as a door knob.
Source:
North Carolina Black Business Directory: Black Inventors
Museum of Black Inventions and Innovations: Black Inventors and Their Invention List
University of California Irvine: Historical African American Inventors
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