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 5935-00-418-3307
NSN 5930-01-463-9237
NSN 5975-01-143-0147
NSN 6240-00-468-7089
NSN 6110-01-368-1528
NSN 5935-01-142-3198
NSN 5895-00-951-3995
NSN 5950-00-872-1999
NSN 2925-01-202-7235
NSN 6130-01-200-9637
NSN 6130-01-345-2667
NSN 6220-00-357-9534