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 5905-01-185-4150
NSN 5960-01-541-9884
NSN 5935-00-892-3059
NSN 5985-00-699-2520
NSN 5855-00-904-0684
NSN 5920-01-559-4725
NSN 5905-00-905-5268
NSN 5920-01-394-4452
NSN 5990-00-133-0102
NSN 5965-01-288-0721
NSN 5935-01-193-5757
NSN 6220-01-489-5687