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 5915-01-341-1296
NSN 5998-01-548-0401
NSN 5930-01-650-1834
NSN 6650-01-345-4306
NSN 2925-01-197-7864
NSN 5960-00-289-6591
NSN 5950-01-473-6449
NSN 5975-01-459-7763
NSN 6135-00-078-9931
NSN 6650-01-633-9147
NSN 6110-01-548-3220
NSN 6110-01-122-5916