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 5835-00-356-1658
NSN 6645-01-113-8979
NSN 6135-01-337-9315
NSN 5990-01-408-4188
NSN 6620-01-104-5758
NSN 5895-00-200-7114
NSN 5920-00-682-0500
NSN 6135-00-269-5843
NSN 5990-01-542-4212
NSN 6650-01-481-3618
NSN 6240-01-497-3085
NSN 5999-01-277-3024