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 5999-00-529-0157
NSN 6135-01-497-4516
NSN 5998-00-233-6215
NSN 6320-01-006-6138
NSN 6150-00-518-1402
NSN 5985-01-451-4309
NSN 5855-01-424-2769
NSN 7035-01-112-1054
NSN 5975-00-156-0416
NSN 6650-00-324-4973
NSN 6105-01-160-9480
NSN 5985-01-581-3584