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 4140-00-230-4252
NSN 5960-01-180-8000
NSN 5950-01-023-3096
NSN 7035-01-521-3449
NSN 5990-00-277-3763
NSN 5999-01-133-3735
NSN 6240-01-513-6526
NSN 5905-00-896-5204
NSN 5935-00-946-2615
NSN 5895-01-453-9471
NSN 4140-01-060-0962
NSN 5945-01-025-1163