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 6105-01-397-4608
NSN 6320-01-160-8578
NSN 5935-00-806-5184
NSN 6620-01-184-7384
NSN 5855-00-973-5717
NSN 5990-00-277-3763
NSN 6685-01-379-9882
NSN 5930-01-429-0053
NSN 2925-01-091-4734
NSN 5855-00-327-2112
NSN 6220-01-588-4988
NSN 5975-01-394-5063