A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5835-01-485-0210
NSN 5920-01-634-0250
NSN 6240-01-540-2068
NSN 5895-00-267-7430
NSN 6135-01-585-8174
NSN 6110-01-154-7066
NSN 5920-01-010-4855
NSN 6145-01-487-5589
NSN 5935-01-136-4020
NSN 6620-01-345-9488
NSN 5835-01-005-8564
NSN 5855-01-350-4479