The Deutsche Gesellschaft für Schädlingsbekämpfung mbH (translation: German Corporation for Pest control), in short Degesch, is a German chemical corporation, Degesch had the patent of the infamous Zyklon B, was the trade name of a cyanide-based pesticide invented in which country in the early 1920s?
Degesch:  Degesch had the patent of the infamous Zyklon B, a pesticide that was used to execute people in gas chambers of German extermination camps during the Holocaust. Zyklon B: Zyklon B ( ; ] ; translated Cyclone B) was the trade name of a cyanide-based pesticide invented in Germany in the early 1920s.
Germany