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 5835-00-170-5238
NSN 5930-00-734-1148
NSN 5835-01-307-4512
NSN 5999-01-447-2960
NSN 6130-00-594-3981
NSN 5835-00-302-5296
NSN 6130-01-472-1932
NSN 5999-01-269-5057
NSN 5999-01-401-5322
NSN 5935-01-284-0522
NSN 5998-01-583-2285
NSN 6645-00-641-3202