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 4140-01-254-2739
NSN 5960-00-073-9277
NSN 4140-00-818-5734
NSN 5915-00-569-1434
NSN 5950-00-581-9999
NSN 5915-01-132-3085
NSN 6240-01-148-4627
NSN 5985-01-500-0880
NSN 6105-00-167-7576
NSN 5915-01-541-3957
NSN 6105-01-144-2055
NSN 5925-01-145-4565