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 6150-01-538-1663
NSN 6105-01-422-0510
NSN 6320-01-094-2634
NSN 6220-00-441-7202
NSN 6145-01-440-3803
NSN 6610-01-551-1895
NSN 6145-01-544-2990
NSN 5915-01-161-3280
NSN 5925-01-644-5658
NSN 5998-01-189-9166
NSN 5960-01-113-4839
NSN 5999-01-400-1652