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 5930-00-899-3740
NSN 5935-01-323-5361
NSN 5855-01-069-4742
NSN 5999-00-852-2518
NSN 6145-00-811-3393
NSN 6145-01-211-9798
NSN 5905-01-323-4688
NSN 7035-01-029-7221
NSN 5960-00-079-8489
NSN 6105-00-392-2917
NSN 6620-01-392-7191
NSN 5905-01-373-9018