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 5950-00-578-7330
NSN 5915-00-642-9997
NSN 6620-01-221-2643
NSN 6105-01-519-0990
NSN 5998-00-277-4990
NSN 5835-01-136-3394
NSN 5990-01-531-5962
NSN 5965-01-046-9619
NSN 6645-01-361-1860
NSN 6620-01-278-8028
NSN 5990-01-219-2703
NSN 6650-00-170-5095