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 6240-01-255-5080
NSN 6135-01-549-9995
NSN 5855-00-436-3852
NSN 2925-01-364-7926
NSN 6620-01-175-2084
NSN 5998-01-163-9270
NSN 5996-00-518-0460
NSN 6135-00-497-0491
NSN 5960-01-438-0245
NSN 6145-01-545-0960
NSN 6145-01-515-4640
NSN 5835-01-017-7486