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 6650-01-605-5805
NSN 6220-01-506-7189
NSN 7035-00-445-9657
NSN 5965-01-517-6402
NSN 6130-00-093-7481
NSN 5999-00-146-5581
NSN 5998-00-470-1627
NSN 5975-01-458-1113
NSN 5920-01-616-0910
NSN 7035-01-443-3052
NSN 6650-00-693-7952
NSN 5920-01-105-0684