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 6220-00-123-8919
NSN 6130-00-383-7967
NSN 5998-01-320-2543
NSN 5960-00-947-2746
NSN 7035-01-537-2644
NSN 5999-01-172-6262
NSN 6650-01-334-9410
NSN 6135-01-222-5464
NSN 6135-01-495-0933
NSN 5910-00-004-0587
NSN 6220-01-454-4022
NSN 5855-01-147-4785