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Helicopter or the Aerial Screw

Though the first actual helicopter wasn’t built until the 1940s, it is believed that Leonardo da Vinci’s sketches from the late fifteenth century were the predecessor to the modern day flying machine.
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and how old are you?
that u dont need to know but my school is Naga City Science Highschool...
ohrayt im in makati city
okay i gotta do something...

it feels nice to help someone out tho... bye! ^_^
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