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 5835-00-192-9568
NSN 5905-01-601-0483
NSN 5985-01-400-5948
NSN 6220-01-555-0716
NSN 5990-01-211-6136
NSN 5996-01-014-6103
NSN 5965-01-080-4021
NSN 5975-01-362-0425
NSN 6240-01-126-9167
NSN 5998-00-923-3369
NSN 5998-00-793-2009
NSN 6220-01-083-3092