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Level 4
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Richard Gatling
Gatling Gun
Gordon Gould
Laser
Johannas Gutenberg
Printing Press
Thomas Edison
Light Bulb
Ruth Handler
Barbie Doll
Richard M Hollingshead
Drive-in Movie Theater
Elias Howe
Sewing Machine
Walter Hunt
Safety Pin
Thomas Jefferson
Swivel Chair
Jack Kilby
Microchip
Richard Knerr
Hula Hoop
Anton Von Leeuwenhoek
Microscope
Benjamin Franklin
Iron Furnace Stove
Guglielmo Marconi
Radio
Forrest Mars
M&Ms Chocolate
