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 6145-00-068-5540
NSN 5835-01-599-1876
NSN 6145-01-571-7928
NSN 5895-01-161-4142
NSN 6145-00-596-8447
NSN 6135-00-334-4500
NSN 5910-01-207-0909
NSN 6220-01-292-0980
NSN 5925-01-469-6667
NSN 5945-01-578-4625
NSN 5998-01-582-2073
NSN 4140-01-272-0219