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 7035-01-158-8860
NSN 5855-01-133-3587
NSN 6110-01-577-9692
NSN 6110-01-303-2150
NSN 5855-01-122-9418
NSN 5999-01-110-0673
NSN 6105-01-565-6706
NSN 2925-01-311-0446
NSN 5999-01-199-4313
NSN 2925-01-455-2558
NSN 5950-01-359-8952
NSN 5835-01-314-2781