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 6135-01-320-9207
NSN 6240-01-306-3417
NSN 5996-00-073-6999
NSN 5835-01-307-8954
NSN 5950-01-369-9476
NSN 6105-00-968-3189
NSN 6240-01-224-6941
NSN 6130-00-578-6637
NSN 5895-01-316-7862
NSN 4140-01-598-4686
NSN 6620-00-568-3947
NSN 5998-01-483-4046