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 5930-01-464-5492
NSN 5930-01-541-6715
NSN 6110-01-418-7762
NSN 6145-01-634-0388
NSN 5835-01-132-5894
NSN 6320-00-790-4844
NSN 4140-00-707-5963
NSN 5965-01-045-0247
NSN 5920-00-779-0827
NSN 5965-00-558-3684
NSN 6620-00-678-8777
NSN 5999-01-290-6664