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 6220-01-042-7729
NSN 5998-01-345-8144
NSN 6240-01-114-1926
NSN 5975-00-817-4476
NSN 6220-00-276-8681
NSN 5950-01-581-7278
NSN 6135-01-184-0727
NSN 6610-01-644-2546
NSN 5999-01-119-0197
NSN 5945-00-348-7458
NSN 5999-01-192-7765
NSN 5935-01-442-0150