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 5975-01-310-5711
NSN 5999-01-227-8440
NSN 5945-01-591-3969
NSN 6620-01-084-2255
NSN 6110-01-342-6869
NSN 5945-01-506-3707
NSN 6145-01-392-1305
NSN 5905-00-277-7439
NSN 6105-01-573-5721
NSN 5835-00-858-3650
NSN 5925-00-275-7599
NSN 5895-01-523-6341