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 6620-01-642-1843
NSN 5999-00-171-8858
NSN 6240-01-247-1512
NSN 6240-00-776-1614
NSN 5965-01-581-1284
NSN 5950-00-056-2145
NSN 6110-01-361-9929
NSN 5905-00-438-8441
NSN 5975-00-728-3224
NSN 6240-01-506-9294
NSN 5975-01-607-7925
NSN 5996-01-598-5465