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 5930-01-425-1100
NSN 6110-01-360-6808
NSN 6220-00-987-1694
NSN 5990-01-116-2181
NSN 5960-00-636-4834
NSN 7035-01-349-4348
NSN 5990-00-543-2755
NSN 5996-00-734-5364
NSN 5930-01-396-5488
NSN 5950-00-980-2499
NSN 6620-01-557-1941
NSN 5905-01-559-4077