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 5985-00-141-5971
NSN 7035-00-533-4464
NSN 6240-01-597-4870
NSN 7035-00-830-1235
NSN 5945-00-004-1993
NSN 5965-00-775-6496
NSN 5910-00-581-9843
NSN 6110-00-809-1401
NSN 6105-01-472-7138
NSN 5920-01-352-7223
NSN 6220-01-272-9239
NSN 4140-01-242-2296