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• 16:17, 13 February 2025 ChrisVG talk contribs created page Patent for Verfahren und Vorrichtung insbesondere für Bühnenprojektion. Geyling, Planer & Schrapringer, 1930 (Q38419) (wbeditentity-create:2|en: Patent for Verfahren und Vorrichtung insbesondere für Bühnenprojektion., Patent for method and device, in particular for stage projection.)