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 4140-00-640-6811
NSN 6610-00-111-3159
NSN 6130-00-361-7114
NSN 5999-01-500-1835
NSN 6150-01-288-9983
NSN 6240-00-776-1614
NSN 5835-01-460-6054
NSN 5945-01-331-0591
NSN 5998-01-617-0711
NSN 5925-00-701-5065
NSN 6145-00-199-8066
NSN 5835-00-912-5656