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 6610-00-855-2821
NSN 5915-01-278-1687
NSN 5895-01-577-6314
NSN 5990-00-613-2279
NSN 6320-01-612-7035
NSN 5985-00-812-4676
NSN 6645-01-633-1852
NSN 5996-01-633-7979
NSN 5905-01-502-9201
NSN 5935-01-258-3817
NSN 5910-01-056-6588
NSN 5990-01-641-0123