Theophilus Van Kannel
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Theophilus Van Kannel (1841 – December 24, 1919) was a Swiss-American inventor, famous for inventing the revolving door, patented on August 7, 1888. He was born in Philadelphia, Pennsylvania. Van Kannel, who was recognized for his invention with an award from the Franklin Institute, founded the Van Kannel Revolving Door Company, which eventually was bought out by the International Steel Company in 1907. International Steel Company is the parent company of International Revolving Door Company.
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