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 5990-01-382-5364
NSN 6650-00-030-2257
NSN 4140-00-924-8116
NSN 5925-01-136-4968
NSN 6240-00-431-4372
NSN 5910-01-310-9716
NSN 5950-00-666-1887
NSN 6620-01-235-3752
NSN 6320-01-562-1599
NSN 6240-00-787-8329
NSN 5945-00-051-9205
NSN 6105-01-053-3727