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 6130-01-353-7282
NSN 6130-01-011-3898
NSN 5999-01-170-4738
NSN 5915-01-254-4458
NSN 5996-01-101-4673
NSN 5905-01-184-7264
NSN 5998-01-383-5939
NSN 5935-01-394-5187
NSN 4140-00-269-5795
NSN 5990-00-473-1809
NSN 6105-01-170-4751
NSN 6130-01-430-2887