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 4140-01-384-2858
NSN 5998-01-449-3037
NSN 5996-00-768-2845
NSN 6145-00-844-3777
NSN 6645-01-382-4940
NSN 6610-00-467-7152
NSN 6110-00-085-5696
NSN 5935-01-466-5902
NSN 6685-00-634-9964
NSN 6685-00-175-9382
NSN 5998-01-502-8879
NSN 6135-00-801-0587