04/22/2015 12:28 pm ET Updated Apr 22, 2015

Detroit Just Had the Single Largest Tax Foreclosure in American History

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Unlike so many industrial innovations, the revolving door was not developed in Detroit. It took its first spin in Philadelphia in 1888, the brainchild of Theophilus Van Kannel, the soon-to-be founder of the Van Kannel Revolving Door Company. Its purpose was twofold: to better insulate buildings from the cold and to allow greater numbers of people easier entry at any given time.

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