General usage
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 6135-00-932-3136
NSN 6685-00-419-6760
NSN 4140-01-015-5137
NSN 5925-00-485-2851
NSN 6320-01-600-0787
NSN 5960-01-391-8860
NSN 5945-01-422-9198
NSN 5855-01-353-3958
NSN 6650-01-406-4959
NSN 6620-00-379-2856
NSN 5945-01-598-1225
NSN 5998-01-137-8889