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 5990-01-218-5160
NSN 5895-00-522-7820
NSN 6320-01-111-8851
NSN 6220-01-127-8761
NSN 5855-00-149-0766
NSN 6685-01-468-6711
NSN 6135-00-255-1340
NSN 2925-01-562-1663
NSN 5950-01-117-6351
NSN 6135-01-566-1034
NSN 5895-01-298-0125
NSN 5895-01-131-2666