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 5925-00-020-8917
NSN 5835-01-056-9303
NSN 6320-01-527-0211
NSN 6105-01-266-9085
NSN 5996-01-093-6971
NSN 5998-01-073-7374
NSN 5950-01-486-3932
NSN 6130-00-944-8781
NSN 6145-01-203-9468
NSN 6240-01-101-1323
NSN 6105-01-302-6160
NSN 5998-01-263-8779