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 6220-01-582-8552
NSN 6150-01-431-7624
NSN 5935-01-268-2278
NSN 5945-01-371-4228
NSN 5999-00-687-1626
NSN 5999-01-070-1473
NSN 5975-00-337-0448
NSN 5990-01-305-8121
NSN 2925-00-909-2596
NSN 5996-01-044-6958
NSN 6610-00-872-7600
NSN 6620-00-707-4195