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 6650-01-327-4122
NSN 7035-01-161-9878
NSN 5925-01-381-8987
NSN 5960-01-489-1510
NSN 6105-01-419-5447
NSN 5999-00-166-6920
NSN 5945-01-184-2470
NSN 6620-00-028-3370
NSN 7035-01-570-8192
NSN 5965-01-478-9375
NSN 6145-00-333-9324
NSN 5895-01-379-8611