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 5975-01-433-2169
NSN 5935-00-170-5323
NSN 6135-01-412-0404
NSN 5975-01-430-6899
NSN 5950-01-174-5449
NSN 5930-00-862-2021
NSN 5999-00-122-6567
NSN 5990-01-134-7756
NSN 5990-01-116-2181
NSN 5990-00-719-4947
NSN 6685-01-223-7264
NSN 5996-01-466-4577