Alexander Miles was a black inventor who invented the electric elevator on October 11, 1887. Even though he didn't invent the first elevator, however he improved the method of the opening and closing of elevator doors and he improved the closing of the opening to the elevator shaft when an elevator was not on that floor, using an automatic mechanism he created that closed access to the shaft. Before elevators needed people to close the door manually.
And sometimes when people forget to close the doors it led to accidents involving people falling down the elevator shafts. The improvement of the elevator led to less accidents including elevators today.
Here are some of his designs:
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