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 6685-01-634-0611
NSN 5990-01-627-8097
NSN 5960-00-827-1201
NSN 6105-01-012-3299
NSN 5998-00-377-3807
NSN 5905-01-519-6346
NSN 6620-00-286-5721
NSN 5965-01-173-9106
NSN 5999-01-181-6769
NSN 6135-01-469-7574
NSN 5996-00-493-7965
NSN 5985-01-135-2307