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 5945-00-587-8829
NSN 5930-00-983-3962
NSN 6150-01-650-0830
NSN 6110-01-098-4803
NSN 6145-00-575-7190
NSN 6650-01-324-6458
NSN 5996-00-389-7404
NSN 5835-00-130-6404
NSN 6150-00-067-0145
NSN 5965-01-625-9234
NSN 6685-00-553-8733
NSN 6220-00-462-0358