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 4140-00-833-2952
NSN 6145-01-602-2630
NSN 6145-00-126-1606
NSN 6150-01-576-8201
NSN 5925-01-215-2119
NSN 5895-01-337-1829
NSN 5855-01-100-3272
NSN 6240-00-726-4547
NSN 6110-00-012-5514
NSN 6135-01-059-4055
NSN 5905-01-551-9954
NSN 5895-01-372-3372