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 5998-00-205-0362
NSN 5910-01-098-4474
NSN 6110-01-460-1967
NSN 5910-00-401-6685
NSN 5835-01-557-4914
NSN 5835-00-770-2843
NSN 6645-00-007-5305
NSN 5895-00-963-8751
NSN 6135-01-255-9129
NSN 2925-01-350-8372
NSN 5920-01-044-1869
NSN 5930-01-501-6396