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 5935-01-397-9909
NSN 5945-01-373-3047
NSN 5998-01-275-7241
NSN 5996-00-008-7960
NSN 5910-01-272-1993
NSN 5960-01-270-6362
NSN 5915-00-005-4114
NSN 5996-01-272-7879
NSN 5905-01-282-9804
NSN 5905-00-133-3507
NSN 5910-01-497-6855
NSN 5855-00-906-5386