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 5996-00-187-1424
NSN 5910-01-595-9038
NSN 5998-01-387-4941
NSN 6110-01-499-9123
NSN 6620-01-449-3101
NSN 6240-00-480-7896
NSN 6620-01-168-8450
NSN 5998-00-596-8869
NSN 5895-00-250-2022
NSN 6320-01-390-5385
NSN 6610-01-527-0922
NSN 5965-01-572-2794