Grey rectangular non-ferrous metal plate with 2 1/8" diameter clear plastic window and two silver-toned metal clips on long sides. Black rubber gasket around edge on interior-facing side. The paper tag is in German and appears to be a type of maintenance or installation ticket. Created by Benjamin G. Sullivan Date Created 09/20/2019 Source Smithsonian National Air and Space Museum Keywords Aviation; Cold War Rights and Restrictions Not determined
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