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 6620-01-231-9731
NSN 6240-00-364-0850
NSN 6320-01-575-6342
NSN 5895-01-046-7723
NSN 5930-01-219-8971
NSN 5975-00-960-5879
NSN 5975-00-295-7005
NSN 6320-01-447-4289
NSN 6110-01-089-9017
NSN 6645-01-261-4863
NSN 6320-00-456-2092
NSN 5915-01-417-3123