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 5960-01-056-3041
NSN 5910-00-754-9439
NSN 5998-00-369-9114
NSN 5835-01-642-4705
NSN 5915-01-011-4750
NSN 5996-01-602-3992
NSN 5855-01-519-2486
NSN 5945-00-054-2419
NSN 6240-01-263-8190
NSN 5920-01-182-7425
NSN 6645-01-503-8211
NSN 5996-00-373-9001