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African American Inventors

Some of the greatest inventions being usec in the 20th Century created by African Americans.
Across
Inventions related to cataracts
Hairbrush with synhetic bristles
The ironing board
Farmers almanac and wooden clock
Adjustable mirror for barbershops
Improved automatic railroad car couplers
Refrigeration System
Mailbox
Software for EEO claims and investigations
Street sweeper
Super soaker water gun
Blind inventor that created clothes dryer and automatic gear shift
Steamboat propellor
Down
Microphones and digital stethoscopes
Seed planter
Computer processing chip
Process for refined coconut oil
Mechanical ice cream scoop
Carbon lightbulb fiaments
Lubrication system for steam engines