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 5895-01-235-9178
NSN 5915-00-383-1471
NSN 6650-00-474-7420
NSN 5975-01-149-8483
NSN 4140-01-362-9957
NSN 5835-01-430-4765
NSN 6135-01-162-0943
NSN 2925-00-684-7708
NSN 6240-01-153-2861
NSN 4140-01-250-4202
NSN 6150-01-651-4556
NSN 6105-00-881-3080