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 4140-01-278-1310
NSN 5985-01-658-0278
NSN 5910-01-046-9416
NSN 5930-00-233-6845
NSN 5996-01-633-7979
NSN 6150-00-948-7170
NSN 7035-01-494-1161
NSN 7035-01-271-1643
NSN 5930-01-253-9890
NSN 5920-01-632-0657
NSN 5990-00-505-1546
NSN 6620-00-223-6753