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 4140-00-534-1408
NSN 5895-00-120-1195
NSN 6650-01-465-2706
NSN 5999-00-479-6700
NSN 6320-01-406-6098
NSN 5998-01-571-1606
NSN 5965-00-471-5018
NSN 4140-01-380-1924
NSN 5905-01-196-1024
NSN 6135-01-226-4071
NSN 5930-00-063-5991
NSN 5950-01-496-7818