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 4140-01-238-1373
NSN 5965-01-360-4329
NSN 5990-00-524-2293
NSN 6145-00-532-6341
NSN 5950-01-081-1737
NSN 5999-00-883-1451
NSN 6105-00-885-4031
NSN 5895-01-331-3957
NSN 6110-01-542-9188
NSN 5935-01-641-8504
NSN 6685-01-646-0455
NSN 6110-01-250-3636