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 5915-00-451-8674
NSN 6610-01-587-8491
NSN 5975-00-956-6105
NSN 5998-00-763-6261
NSN 5990-00-922-7317
NSN 5835-01-544-5183
NSN 6240-01-571-3684
NSN 6105-01-325-1786
NSN 6105-01-253-9517
NSN 6145-00-752-2038
NSN 6145-01-422-0806
NSN 5945-01-452-1067