Image: PatentzeichnungStormDoor
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Description: Technische Zeichnung der storm door von Theophilus van Kannel aus der Patentschrift zur Patentnummer 387571 vom 7. August 1888
Title: PatentzeichnungStormDoor
Credit: Patentschrift für die Sturmtür (storm door) von Theophilus van Kannel auf https://www.google.com/patents/US387571?hl=de
Author: Theophilus van Kannel
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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