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 5965-00-936-9081
NSN 6145-00-497-1578
NSN 6150-00-087-0815
NSN 6145-01-048-1227
NSN 6650-00-336-0753
NSN 6105-01-647-7845
NSN 5960-01-039-2221
NSN 6150-01-386-3844
NSN 6105-00-655-3083
NSN 5996-01-305-8812
NSN 5915-00-007-3813
NSN 5975-01-179-7728