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 5925-00-355-6124
NSN 5835-01-055-6859
NSN 7035-01-451-6421
NSN 5905-00-277-7439
NSN 5998-00-397-3074
NSN 5855-00-757-5149
NSN 5915-01-605-3326
NSN 5996-00-336-3046
NSN 5915-00-958-2622
NSN 6645-00-406-8114
NSN 5855-01-020-7982
NSN 6105-01-383-8699