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 5855-01-400-1590
NSN 6620-00-910-5464
NSN 5945-01-389-1895
NSN 4140-00-344-8601
NSN 6220-01-113-6431
NSN 6145-01-607-9868
NSN 5835-01-065-8481
NSN 5910-01-220-3476
NSN 6145-00-850-6199
NSN 5950-01-608-4489
NSN 5975-01-106-7561
NSN 5895-00-888-2571