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 6645-00-801-8237
NSN 6240-00-783-2853
NSN 4140-01-228-8356
NSN 6645-01-426-8621
NSN 5945-01-533-0215
NSN 5925-01-491-5057
NSN 5835-00-823-6116
NSN 5945-00-764-8878
NSN 5915-01-167-2358
NSN 5996-01-144-4691
NSN 6685-01-607-6481
NSN 5895-01-407-3392