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 6150-00-412-1908
NSN 5975-01-243-5415
NSN 5855-01-431-8937
NSN 5985-01-208-6571
NSN 6220-01-044-5552
NSN 5999-01-019-7463
NSN 5985-01-391-2731
NSN 6620-00-019-4640
NSN 7035-00-803-3056
NSN 6620-00-800-5579
NSN 6150-01-227-1924
NSN 5998-01-406-5427