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 5998-01-200-2050
NSN 5855-01-258-5161
NSN 5930-01-166-0062
NSN 5990-00-816-9289
NSN 5975-01-188-7460
NSN 5960-00-562-1939
NSN 5999-01-227-5689
NSN 5999-01-010-1466
NSN 6650-01-457-8743
NSN 5996-00-968-9458
NSN 7035-01-348-5153
NSN 5895-01-367-7651