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 5905-00-454-5237
NSN 5990-01-022-6592
NSN 6110-00-450-0194
NSN 6105-00-455-8879
NSN 5998-01-279-1102
NSN 5905-00-470-1652
NSN 2925-00-888-9551
NSN 6645-01-170-5402
NSN 5990-01-421-5342
NSN 5935-01-184-1393
NSN 5996-01-019-0664
NSN 5935-00-949-8236