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• 20:12, 30 July 2023 ChrisVG talk contribs created page Patent for a Buehnenscheinwerfer, Willy Hagedorn, 1921 (Q31872) (wbeditentity-create:2|en: Patent for a Buehnenscheinwerfer, Willy Hagedorn, 1921, a spotlight with a diafragm.)