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 5999-00-120-0206
NSN 6105-01-576-9045
NSN 5835-01-399-5820
NSN 2925-01-397-2495
NSN 6620-00-286-5721
NSN 6145-00-530-0951
NSN 5975-01-368-0689
NSN 6145-01-055-8851
NSN 5950-01-660-0241
NSN 6145-01-657-3777
NSN 6645-00-925-0111
NSN 5999-00-317-6262