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 5998-00-591-9125
NSN 2925-01-262-1418
NSN 5990-01-218-5160
NSN 6620-01-231-9731
NSN 6105-00-437-2623
NSN 5960-01-443-3067
NSN 6220-00-823-6688
NSN 5960-01-307-6692
NSN 6105-00-578-8114
NSN 2925-01-097-0903
NSN 6220-00-931-8837
NSN 5975-01-029-4879