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 5905-01-135-9694
NSN 5930-01-577-6235
NSN 5960-01-294-2397
NSN 6610-01-084-6738
NSN 6150-00-851-1207
NSN 5999-00-687-1626
NSN 5835-00-977-1254
NSN 5945-01-607-0431
NSN 6150-01-174-5568
NSN 5835-01-320-8306
NSN 6110-01-145-1481
NSN 4140-01-165-2663