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 5935-01-022-5980
NSN 6645-01-114-8044
NSN 5950-01-521-3985
NSN 5999-01-437-1252
NSN 6610-00-927-7415
NSN 5945-01-325-4621
NSN 5920-01-417-1928
NSN 6620-01-407-1158
NSN 6650-01-256-9151
NSN 5915-01-440-6087
NSN 5996-01-525-2212
NSN 5998-01-414-7684