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 5945-01-359-1974
NSN 6150-00-632-7234
NSN 6150-00-773-5147
NSN 5965-00-772-8024
NSN 5960-01-238-7367
NSN 5920-01-485-5148
NSN 7035-01-632-4537
NSN 5920-01-425-5241
NSN 5835-01-028-2025
NSN 6135-01-611-8483
NSN 6130-01-534-6634
NSN 6320-00-004-9158