Theophilus Van Kannel patents the revolving door - August 7th, 1888

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On this day in 1888, American inventor Theophilus Van Kannel was granted a patent for the revolving door.See omnystudio.com/listener for privacy information.

Episode metadata supplied by the publisher feed · Published Aug 7, 2023

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On this day in 1888, American inventor Theophilus Van Kannel was granted a patent for the revolving door.

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Theophilus Van Kannel patents the revolving door - August 7th, 1888

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