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 5950-01-564-1151
NSN 5895-01-244-1479
NSN 5985-00-621-7587
NSN 5945-01-363-5950
NSN 6135-00-823-3034
NSN 5930-01-332-4014
NSN 5930-01-352-7942
NSN 6620-00-796-5666
NSN 7035-00-931-9415
NSN 5998-01-549-8858
NSN 6320-01-573-6490
NSN 6620-01-322-0018