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 5925-01-620-6013
NSN 6145-00-472-9183
NSN 5950-00-140-9696
NSN 5999-01-581-1837
NSN 6135-01-395-2388
NSN 5835-01-581-1957
NSN 5950-01-651-3220
NSN 5996-01-248-6911
NSN 5985-01-380-0656
NSN 6620-01-234-1799
NSN 5945-01-416-4191
NSN 5835-01-454-5267