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 5999-01-391-4996
NSN 5945-01-451-2018
NSN 6650-01-183-0711
NSN 6645-00-819-5045
NSN 5925-01-655-0824
NSN 5905-01-025-6949
NSN 5999-00-243-2552
NSN 6240-01-235-2604
NSN 5985-00-317-8237
NSN 5950-00-421-7792
NSN 6110-01-106-9945
NSN 5835-01-223-5084