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Inventor of elevator doors that open and close
Inventor of products from peanuts like peanut butter, face lotion, and glue
Inventor of the traffic signal
Inventor of the Super Soaker Water Gun
Inventor of the first home security system
Recorded as the first female self-made millionaire; invented the hot comb
Inventor of the fire extinguisher
Inventor of the hand-cranked pencil sharpener
