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 5990-00-938-4302
NSN 5905-00-399-8662
NSN 6620-01-087-2354
NSN 6135-01-416-8342
NSN 5996-01-471-7315
NSN 5945-01-215-6073
NSN 5895-01-014-4016
NSN 5999-00-648-9107
NSN 6240-00-263-0549
NSN 5910-01-391-5303
NSN 5935-01-634-0668
NSN 5945-00-388-3253