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 6650-01-040-8225
NSN 5965-01-551-1900
NSN 5915-01-630-0872
NSN 6320-00-882-7061
NSN 5855-01-375-2152
NSN 5835-00-262-6146
NSN 5920-01-553-1724
NSN 5996-01-057-1981
NSN 6150-01-338-7967
NSN 6650-01-552-1397
NSN 5905-01-551-1288
NSN 6240-01-474-1846