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 5895-00-276-7916
NSN 5915-01-321-7378
NSN 5975-01-128-3867
NSN 5905-01-074-3824
NSN 6145-01-401-3713
NSN 7035-01-644-5251
NSN 5935-01-237-2652
NSN 6135-01-439-8669
NSN 6130-01-271-6709
NSN 5996-01-407-3777
NSN 6650-01-301-8806
NSN 5930-01-052-7293