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 6110-00-999-8909
NSN 5915-01-368-1168
NSN 5965-01-653-0376
NSN 6220-00-012-3620
NSN 5975-00-553-7151
NSN 5996-01-535-6443
NSN 5999-00-055-1042
NSN 5998-01-040-0364
NSN 6320-01-426-1324
NSN 5910-00-316-0944
NSN 5920-01-516-0467
NSN 5950-00-414-3169