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: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 5999-01-601-5495
NSN 5996-01-380-5946
NSN 5960-01-452-1907
NSN 5999-01-230-2109
NSN 6240-01-158-5664
NSN 4140-01-486-7172
NSN 5985-00-321-8031
NSN 5985-01-339-9743
NSN 5990-01-168-6797
NSN 2925-01-217-0465
NSN 5990-00-108-5400
NSN 6130-01-493-2291