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 6110-00-563-7672
NSN 6685-01-466-9005
NSN 5945-01-546-7900
NSN 6620-01-437-0387
NSN 5960-01-495-0859
NSN 5895-00-262-2439
NSN 6220-01-235-7091
NSN 5855-00-256-5562
NSN 6620-00-133-2633
NSN 6145-01-634-0388
NSN 6130-01-316-3648
NSN 5990-00-826-7051