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 5960-01-493-3948
NSN 5935-00-392-7793
NSN 5950-01-439-1116
NSN 5990-01-609-4793
NSN 5975-01-634-0678
NSN 6685-01-097-7628
NSN 6135-00-175-7132
NSN 5999-00-553-9831
NSN 6110-01-576-2486
NSN 5985-00-473-5453
NSN 5910-01-365-3974
NSN 4140-01-118-6848