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 5990-00-073-2676
NSN 6135-01-235-4168
NSN 5975-00-999-4281
NSN 6150-00-377-8616
NSN 6110-01-542-0762
NSN 5935-00-581-8134
NSN 5950-00-466-8156
NSN 6240-01-262-0149
NSN 4140-00-099-9205
NSN 5965-01-474-8265
NSN 5996-00-734-5364
NSN 5965-00-454-8706