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 5999-01-144-1215
NSN 6685-01-527-0350
NSN 6130-00-973-7866
NSN 6145-01-138-5231
NSN 6105-00-282-8943
NSN 5925-00-973-1160
NSN 6150-00-657-0083
NSN 6130-00-424-7085
NSN 2925-00-257-2872
NSN 5905-00-087-4834
NSN 5996-01-469-6848
NSN 5915-00-597-0038