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 6685-01-274-0759
NSN 6220-01-020-8018
NSN 6150-01-049-8089
NSN 5996-00-482-1170
NSN 6150-01-649-3598
NSN 5985-01-046-3131
NSN 6620-01-535-4358
NSN 5925-00-945-5463
NSN 5855-01-145-4903
NSN 5960-01-328-8248
NSN 6610-00-209-4372
NSN 5920-01-557-7552