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 6240-01-581-7737
NSN 5925-01-466-0676
NSN 5998-00-121-9827
NSN 6105-00-724-4959
NSN 5945-00-042-5553
NSN 6150-01-114-0307
NSN 6685-01-141-7034
NSN 5935-00-891-6160
NSN 6150-01-537-9881
NSN 6220-01-578-2435
NSN 5925-01-378-0038
NSN 5975-01-502-6167