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 6240-00-832-6867
NSN 4140-01-467-1986
NSN 5945-01-294-5616
NSN 6110-01-425-5355
NSN 5990-01-339-9238
NSN 5996-01-421-9391
NSN 5835-01-435-4139
NSN 5990-01-331-2221
NSN 5960-00-538-3375
NSN 5945-00-850-1203
NSN 5905-01-610-9820
NSN 5998-00-156-6275