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 6650-01-449-0702
NSN 4140-01-343-1246
NSN 6240-01-462-4812
NSN 6240-01-400-1311
NSN 5965-01-198-3256
NSN 6220-01-178-9041
NSN 6650-00-932-1144
NSN 6240-00-702-6955
NSN 5945-01-302-2302
NSN 5965-00-757-3403
NSN 4140-01-392-9808
NSN 5960-00-901-4312