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 5910-00-495-2504
NSN 5950-00-254-8290
NSN 5965-00-905-6895
NSN 6130-01-247-1618
NSN 5945-01-351-4694
NSN 5915-01-083-7464
NSN 6145-00-372-3713
NSN 2925-01-341-0457
NSN 6110-01-118-1105
NSN 6105-00-884-9401
NSN 5945-00-601-4212
NSN 6130-00-518-4305