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 5905-01-559-8410
NSN 5895-01-386-0135
NSN 5910-01-595-2613
NSN 5960-00-052-6824
NSN 5920-01-067-2289
NSN 5855-00-327-2112
NSN 5999-01-202-1419
NSN 5915-01-041-8314
NSN 4140-01-026-2725
NSN 5985-01-425-1753
NSN 6240-00-388-4598
NSN 5996-00-747-9770