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 6320-00-459-8973
NSN 4140-00-104-7323
NSN 6240-01-004-9634
NSN 5996-00-036-5935
NSN 6105-00-943-5183
NSN 5920-00-296-9869
NSN 6135-01-472-9011
NSN 5930-01-310-5693
NSN 6135-00-078-9931
NSN 5915-01-221-2261
NSN 5990-00-893-0957
NSN 6130-01-025-5546