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 5975-00-631-3295
NSN 6220-01-530-2694
NSN 4140-01-622-7885
NSN 5945-01-241-9835
NSN 5915-01-442-9810
NSN 6650-01-580-5459
NSN 6240-01-025-5847
NSN 6610-01-605-1161
NSN 6105-00-664-1292
NSN 6645-01-076-4655
NSN 5996-00-805-7621
NSN 5935-01-487-6798