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"machine gun" 23 Oct. 2012 <http://www.leonardo-da-vinci-biography.com/images/leonardo-da-vinci-machine-gun.jpg>
"reinvention of tank" 26 Oct. 2012 <http://tanks.net16.net/images/Tank_Images/DaVinciTankAtAmboise.jpg>
Biography: Leonardo da Vinci
28 Oct. 2012 <http://www.biography.com/people/leonardo-da-vinci-40396>
"giant crossbow" 27 Oct. 2012 <http://www.leonardodavincisinventions.com/wp-content/uploads/2012/02/leonardo-da-vincis-crossbow1.jpg>
"chariot" 27 Oct. 2012 <http://uploads3.wikipaintings.org/images/leonardo-da-vinci/scythed-chariot.jpg>
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leonardo da vinci biography: inventions
23 Oct. 2012 <http://www.leonardo-da-vinci-biography.com/>
Universal Leonardo: scythed chariot 27 Oct. 2012 <http://www.leonardo-da-vinci-biography.com/>
Leonardo da Vinci inventions: Leonardo da Vinci's crossbow
27 Oct. 2012 <http://www.leonardodavincisinventions.com/war-machines/leonardo-da-vinci-crossbow/>
"home page picture" 28 Oct. 2012 <http://im.glogster.com/media/4/29/4/20/29042079.jpg>"parachute" 28 Oct. 2012 <http://www.leonardodavincisinventions.com/wp-content/uploads/2012/02/leonardo-da-vincis-parachute.jpg>
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28 Oct. 2012 <http://www.biography.com/people/leonardo-da-vinci-40396>
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leonardo da vinci biography: inventions
23 Oct. 2012 <http://www.leonardo-da-vinci-biography.com/>
Universal Leonardo: scythed chariot 27 Oct. 2012 <http://www.leonardo-da-vinci-biography.com/>
Leonardo da Vinci inventions: Leonardo da Vinci's crossbow
27 Oct. 2012 <http://www.leonardodavincisinventions.com/war-machines/leonardo-da-vinci-crossbow/>
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