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First football
The ball used in the first game was very round like a soccer ball and very hard to hold throw http://www.popularmechanics.com/adventure/sports/a240/1283226/ -
Second Football
The ball was now changed to something rugby like, it was thick and round like a watermelon (exact date was unkown) http://www.popularmechanics.com/adventure/sports/a240/1283226/ -
Third Football
The ball was changed to a bigger version of the ball we have today both longer and thicker. (exact date was unknown) http://www.popularmechanics.com/adventure/sports/a240/1283226/ -
Forth Football
"The Duke" is what people called the football of the National Football League and the later on became the football of american football league for 30 years. (exact date is unknown)
http://www.popularmechanics.com/adventure/sports/a240/1283226/ -
Fifth Football
This ball is white and the reason for that is so for night games the ball is easier to see, it was created by wilson and had a bunch of good upgrades.(exact date unknown)
http://www.popularmechanics.com/adventure/sports/a240/1283226/ -
Sixth Football
This football is this Spalding and it helped the passing game having more cushion on the ball not making it as Hard. (exact date unknown)
http://www.profootballhof.com/photos/gallery/the-evolution-of-the-football/ -
Seventh Football
This one is named Paul Tagliabue because he was the commissioner of the league at the time.(exact date unknown)
http://www.popularmechanics.com/adventure/sports/a240/1283226/ -
Today's Football
It is Roger Goodell's football as he is now the commissioner of the league and they are made exactly as he wants them and very efficient on holding air now. (exact date unknown)
http://www.popularmechanics.com/adventure/sports/a240/1283226/
