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 5920-00-296-9869
NSN 6685-00-395-3272
NSN 5925-01-060-5265
NSN 5998-01-045-2172
NSN 6110-01-450-7313
NSN 5990-00-626-6252
NSN 6135-00-248-4102
NSN 5835-01-381-2683
NSN 6645-01-643-7151
NSN 4140-00-493-4759
NSN 6220-00-066-6457
NSN 6145-01-394-3122