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
Usage conditions apply For more information, visit the Smithsonian’s Terms of Use.