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 6110-01-358-8841
NSN 5935-01-647-0797
NSN 5895-00-005-6895
NSN 6105-00-553-1941
NSN 5835-01-580-0446
NSN 6150-00-115-2027
NSN 5935-01-174-1144
NSN 5945-00-106-1916
NSN 5945-00-964-8677
NSN 5945-00-948-0664
NSN 5985-01-370-3566
NSN 5835-01-009-2417