Twitter Trackbacks for Fun Fact: Rittenhouse Square in #Philadelphia is named after David Rittenhouse - an astronomer, clockmaker and 1st President of the US Mint [twitter.com] on Topsy.com

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phlvisitorcntr Influential Fun Fact: Rittenhouse Square in #Philadelphia is named after David Rittenhouse - an astronomer, clockmaker and 1st President of the US Mint

01/23/2012 Reply Retweet Favorite

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