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 5950-01-634-0677
NSN 5996-01-400-3558
NSN 6105-00-679-6861
NSN 5930-00-875-6709
NSN 2925-01-518-3453
NSN 6685-01-500-4808
NSN 5965-01-023-7095
NSN 5895-01-357-4531
NSN 5915-01-590-4900
NSN 5930-01-436-2620
NSN 5855-01-342-9778
NSN 6130-01-157-9307