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 5835-01-055-2327
NSN 5945-01-593-8801
NSN 6650-01-578-5519
NSN 7035-01-211-5636
NSN 5985-00-153-0864
NSN 5960-01-116-4576
NSN 5930-00-892-1668
NSN 5965-01-539-4304
NSN 5855-01-584-8458
NSN 5855-01-400-1590
NSN 5905-01-614-7245
NSN 6135-00-125-5265