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 5915-00-686-9149
NSN 5999-00-727-4649
NSN 5950-01-243-7471
NSN 6320-01-547-9877
NSN 6620-00-506-0112
NSN 5910-01-512-0626
NSN 5935-01-654-1037
NSN 5999-01-469-1883
NSN 5905-01-204-8737
NSN 5915-00-920-6700
NSN 5965-00-188-5531
NSN 5905-01-239-9684