Berlin was granted German patent DE18349 on December 22, 1881 for Tür ohne Luftzug or 'Door without draft of air', which used a rotating cylinder with a door...
17 KB (2,210 words) - 14:30, 17 September 2024
no. 102. pp. 70–71. Retrieved January 1, 2019. "Frische Brise anstatt Luftzug". Architektur Zeitung (in German). July 22, 2013. Archived from the original...
10 KB (860 words) - 20:35, 16 December 2023