Hardness critical item
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 6105-01-224-7258
NSN 5945-01-169-3568
NSN 5935-01-207-9571
NSN 5855-01-658-6119
NSN 6135-01-429-9029
NSN 6620-00-403-1142
NSN 6130-01-183-9417
NSN 6105-01-439-2660
NSN 4140-01-573-1803
NSN 5950-01-067-7948
NSN 5905-00-528-9975
NSN 5950-01-347-7761