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 5835-01-174-7700
NSN 4140-01-659-0309
NSN 5905-01-523-2497
NSN 5855-01-287-6391
NSN 6110-01-222-7307
NSN 5935-01-445-7928
NSN 7035-01-301-6325
NSN 5835-00-870-7034
NSN 5996-01-613-1207
NSN 5935-00-130-7631
NSN 5930-01-400-0803
NSN 2925-01-099-7075