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 5945-01-559-0510
NSN 6610-01-371-5039
NSN 6110-01-526-6129
NSN 6130-01-481-3599
NSN 5835-01-158-6878
NSN 5998-01-520-9576
NSN 5925-00-190-0095
NSN 6650-00-760-1385
NSN 7035-01-056-5350
NSN 6135-00-488-4478
NSN 5965-01-441-1525
NSN 5935-00-102-7578