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 5965-00-629-5568
NSN 5835-01-461-8184
NSN 5999-01-462-8842
NSN 6320-00-977-3930
NSN 4140-01-369-2959
NSN 5835-01-068-4043
NSN 6240-00-232-7065
NSN 5990-01-299-2014
NSN 6130-01-089-3566
NSN 6105-00-871-9058
NSN 6220-00-772-6840
NSN 5835-01-118-4690