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 2925-00-156-8963
NSN 5998-01-090-1490
NSN 6240-01-267-3573
NSN 6610-01-124-4592
NSN 6650-01-219-3731
NSN 6130-00-405-5836
NSN 5998-00-977-2029
NSN 5960-00-287-9932
NSN 6620-01-415-2307
NSN 5990-01-582-5238
NSN 6610-01-417-3011
NSN 6620-00-865-7932