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 5990-01-242-4493
NSN 2925-01-141-7563
NSN 6150-01-421-2543
NSN 5915-00-974-3646
NSN 6645-01-322-5644
NSN 5975-00-149-0758
NSN 6650-01-017-0980
NSN 6620-00-765-5139
NSN 5998-00-714-5899
NSN 6610-01-144-1951
NSN 5999-01-085-1868
NSN 6610-01-399-7613