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 6110-01-146-3769
NSN 6145-01-634-0388
NSN 5835-01-193-6192
NSN 5975-01-168-7408
NSN 6145-01-551-1045
NSN 5975-01-465-7641
NSN 5935-01-626-6574
NSN 6610-01-454-8386
NSN 5835-01-224-2792
NSN 4140-01-124-2954
NSN 5975-01-347-7892
NSN 5935-01-426-6584