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 6145-00-490-9180
NSN 5855-00-079-2370
NSN 6240-01-426-5581
NSN 5895-00-133-5096
NSN 5985-01-052-2515
NSN 6110-01-380-7184
NSN 7035-01-411-6062
NSN 5950-01-584-9703
NSN 5855-00-135-0797
NSN 5998-01-532-7994
NSN 4140-01-530-7356
NSN 5990-01-440-7135