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 5975-00-408-2794
NSN 5910-00-253-5256
NSN 7035-00-108-4421
NSN 6620-01-383-7519
NSN 6645-01-121-6952
NSN 5905-00-829-5230
NSN 5895-00-288-5878
NSN 5895-01-599-6111
NSN 6620-01-248-0358
NSN 5930-00-414-3296
NSN 6145-00-833-0903
NSN 5935-01-469-7843