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 5905-01-153-2512
NSN 6650-00-555-1061
NSN 5975-01-203-4581
NSN 6110-01-516-4093
NSN 6135-00-369-2368
NSN 5945-01-339-4322
NSN 6320-01-106-4414
NSN 5996-00-791-0703
NSN 5935-00-217-8847
NSN 6650-01-457-0980
NSN 5965-00-062-0559
NSN 5855-00-411-8688