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 5975-00-485-5829
NSN 6620-01-642-7219
NSN 5855-00-586-6255
NSN 5985-00-489-3693
NSN 5990-00-783-4560
NSN 6150-01-533-8951
NSN 6240-01-116-3382
NSN
NSN 5999-01-299-3040
NSN 5998-01-413-5890
NSN 5925-01-252-5883
NSN 5905-01-403-2806