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 5925-01-415-6551
NSN 5945-01-187-5143
NSN 6105-01-255-4028
NSN 5945-00-376-4930
NSN 5895-00-539-8322
NSN 5915-01-287-8188
NSN 5910-00-094-6792
NSN 5960-01-395-9834
NSN 5975-01-485-3210
NSN 5895-01-594-8740
NSN 5895-00-151-3934
NSN 6130-00-248-7244