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The catapult was first used in 400 BCE by The Greek Dionysius the Elder of Syracuse.

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Invented by Chuk or Zhuge Liang. It was used in battle to carry supplies for soldiers and to carry the wounded and dead off the battle feild.
Reese
Jack
Greg

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The seesaw was first created in  1640 by Korean girls that wanted to see over their palace walls.

Rachael
Scarlette
Townsend

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There wasn't one particular person who invented the staple. Over the years there were many who addapted the first stapler, but the one most similar to the stapler we know today was invented by George McGill.

Dylan
Elizabeth

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in 1897 "Abram W. Duck of Duck's Cyclery in Oakland, California was granted a patent for his Duck Roller Brake (U.S. Patent 594,234). The duck brake used a rod operated by a lever on the handlebar to pull twin rubber rollers against the front tyre, breaking the front wheel." - google search engine.
michael
david
mercy

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The diving board was invented by Aaron Kuklinski.
Madeleine
Cypress
Kenny