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 4140-01-642-2272
NSN 5920-01-411-5512
NSN 6130-01-509-5201
NSN 5998-01-591-6325
NSN 2925-01-517-4037
NSN 5975-00-715-3710
NSN 6105-00-089-6824
NSN 5835-01-222-2437
NSN 5855-00-791-5000
NSN 2925-01-141-7563
NSN 5835-01-132-7972
NSN 6645-01-287-9969