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 5935-01-505-8177
NSN 5960-00-067-5784
NSN 6130-00-112-0716
NSN 5999-00-329-5331
NSN 6105-01-236-0799
NSN 5996-00-091-0177
NSN 5985-01-537-1497
NSN 5920-01-243-2312
NSN 5915-00-858-6068
NSN 5835-01-013-9321
NSN 6110-01-411-5687
NSN 6220-01-140-3529