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 5960-01-546-2379
NSN 5998-00-463-5303
NSN 6130-01-421-0964
NSN 6105-01-423-9451
NSN 5999-00-810-7181
NSN 5835-01-109-4775
NSN 5975-00-483-7266
NSN 6320-01-487-0336
NSN 6620-01-025-1443
NSN 6645-01-105-4647
NSN 5930-00-823-4424
NSN 5960-00-368-4084