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 5935-01-400-5949
NSN 5915-01-309-9627
NSN 5905-01-388-1176
NSN 6130-01-427-9604
NSN 6645-01-389-1970
NSN 6645-00-256-4072
NSN 6135-01-495-0933
NSN 6145-00-360-2415
NSN 6240-01-377-5503
NSN 6105-01-330-0675
NSN 6135-01-067-8331
NSN 5996-00-767-4877