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 2925-00-051-1467
NSN 5855-00-149-0766
NSN 6320-01-089-9086
NSN 6110-01-219-7972
NSN 5998-01-475-1598
NSN 5910-01-633-9184
NSN 5998-01-463-2488
NSN 6220-01-247-0086
NSN 6110-01-206-6479
NSN 6135-00-896-3187
NSN 6105-01-561-3792
NSN 6220-00-625-8554