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 5990-00-696-5533
NSN 6105-01-437-6876
NSN 5975-01-578-6071
NSN 5925-01-415-3084
NSN 5905-01-225-0533
NSN 5835-01-263-1293
NSN 2925-00-228-8854
NSN 5905-01-541-4145
NSN 6320-01-036-2598
NSN 7035-01-621-4812
NSN 6130-01-396-0874
NSN 6220-00-754-8375