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 6110-00-407-6829
NSN 2925-01-233-8545
NSN 6150-01-357-6518
NSN 6620-01-058-6308
NSN 5998-00-277-7552
NSN 5996-01-026-2069
NSN 5910-00-015-2563
NSN 5930-00-159-7467
NSN 6645-00-833-2395
NSN 5945-00-329-4825
NSN 2925-00-221-4977
NSN 6685-01-538-0737