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Technology invented/developed in Philadelphia?


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I need to write a paper on a technology invented/developed in Philadelphia like Baldwin Locomotive Works, or water works for my history of technology paper. I am so confused, and 'googled' for it, but I can't find anything. It can be invented by one and can be anything, as long as it has some connection to Philadelphia. Just a topic would be great? Anything you know/remember. Please, I am desperate !!!

Travel Tips
They say Philadelphia is a city of firsts...this list from About.com is a good place to start (check out the last entry on the page):
http://philadelphia.about.com/cs/history...

Another good site:
http://www.ushistory.org/philadelphia/ph...

Good luck! Source(s): about.com
ushistory.org (Indpendence Hall Association)

Other Travel Tips


Ben Franklin invented tons of stuff....bifocals, urinary catheter, many more...you can go to the Franklin Institute website for info...
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