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 6610-00-170-6715
NSN 6240-01-599-7633
NSN 6105-01-184-8181
NSN 5996-01-421-9391
NSN 6150-00-618-0171
NSN 5965-00-973-1090
NSN 6220-01-474-5989
NSN 6620-01-446-7868
NSN 6105-01-232-2713
NSN 5950-01-189-6325
NSN 5998-01-495-0882
NSN 5835-01-399-5820