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 5950-01-117-0062
NSN 2925-01-197-7864
NSN 5835-01-552-3153
NSN 6145-01-517-8681
NSN 5935-00-997-9478
NSN 5975-01-216-7903
NSN 5855-01-096-9294
NSN 6135-01-244-3211
NSN 6620-00-930-4179
NSN 5960-01-495-0859
NSN 5925-00-364-7969
NSN 6110-01-441-3422