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 6150-01-442-8032
NSN 6105-01-323-4695
NSN 6240-01-346-5157
NSN 5950-00-316-3533
NSN 5985-01-206-4086
NSN 5895-00-287-6375
NSN 5895-01-476-7247
NSN 5935-01-440-9404
NSN 5999-00-850-4690
NSN 4140-01-150-4797
NSN 5945-00-885-6405
NSN 6150-00-365-1711