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 6145-01-142-2234
NSN 6320-01-195-5583
NSN 5999-01-361-1493
NSN 6220-01-290-1647
NSN 5855-01-594-2892
NSN 6320-00-115-0883
NSN 4140-01-050-5100
NSN 5965-01-050-8447
NSN 5999-01-501-7131
NSN 5960-01-131-7406
NSN 5996-01-633-7979
NSN 5930-01-244-4421