there were other black folks back in the early 1900's/late 1800's who helped develop a few things...You shouldnt demean Booker T Washington. Its not like you have many great people in history. MLK is a rapist, so he isnt even in the discussion anymore, and without Booker T Washington all you have left is that peanut guy, whatever his name is.
Lewis Latimer....the carbon filament for light bulbs
Alexander Miles....electric elevator doors
Garrett Morgan...invented one of the first three-light traffic systems that were invented in the 1920s,