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 6130-01-153-0937
NSN 5855-01-159-1654
NSN 5930-01-443-3691
NSN 5930-00-003-8483
NSN 5920-01-203-6952
NSN 6150-00-827-9005
NSN 5910-01-607-6388
NSN 6105-01-146-3543
NSN 5960-01-106-0460
NSN 5985-01-158-2248
NSN 5990-01-651-0170
NSN 5835-01-237-3769