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 4140-01-556-8911
NSN 5990-01-264-9759
NSN 6650-01-328-6624
NSN 6150-01-447-3266
NSN 6220-00-682-8292
NSN 5915-00-426-8298
NSN 5998-00-221-6636
NSN 6130-01-654-7422
NSN 5990-01-281-0018
NSN 6220-01-522-3986
NSN 5985-01-412-1085
NSN 5990-00-186-2445