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 5920-01-624-2580
NSN 6620-01-330-3917
NSN 6105-01-360-5629
NSN 4140-00-547-8918
NSN 2925-00-084-8462
NSN 5915-01-371-4194
NSN 5960-00-597-2680
NSN 7035-01-057-6325
NSN 6650-00-915-8545
NSN 5905-01-100-1146
NSN 2925-00-085-7332
NSN 6650-00-012-2430