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 6220-01-581-5986
NSN 6650-01-567-1933
NSN 5905-01-189-9213
NSN 6135-01-437-6409
NSN 6620-01-456-0529
NSN 5990-00-845-2864
NSN 6320-01-067-0474
NSN 5975-01-659-4489
NSN 6145-01-629-3491
NSN 5985-01-435-7088
NSN 5835-01-103-9110
NSN 5895-01-645-4985