Level 4
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Benjamin Holt
Tractor
Richard James
Slinky
Levi Strauss
Blue Jeans
Laszlo Biro
Modern Ballpoint Pen
John Harvey Kellogg
Cornflakes
Montgolfier Brothers
Hot Air Balloon
Robert J. Oppenheimer
Atomic Bomb
Alexey Pajitnov
Tetris
Edward Teller
Hydrogen Bomb
Nikola Tesla
Wireless Communication
Nikola Tesla
Namesake Coil
Alessandro Volta
Battery
Arthur Wynne
Crossword Puzzle
Joseph Glidden
Barbed Wire
Paul Winchell
Artificial Heart
