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 5999-00-936-1263
NSN 6145-01-025-1822
NSN 5950-01-139-3782
NSN 5998-01-363-1468
NSN 5960-00-625-9758
NSN 5990-00-979-8141
NSN 6620-01-494-9858
NSN 5999-01-449-9791
NSN 5999-01-243-0121
NSN 6685-01-232-5882
NSN 6220-01-625-3368
NSN 5996-00-581-5810