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 6240-01-397-8713
NSN 5999-00-722-7720
NSN 6650-01-029-5414
NSN 5998-00-925-2992
NSN 5915-01-063-7134
NSN 6150-00-751-9173
NSN 6135-01-507-4346
NSN 5925-01-592-3077
NSN 6105-01-526-0091
NSN 5935-00-830-4677
NSN 6150-00-483-9088
NSN 2925-00-159-9003