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 5965-00-568-5802
NSN 6135-00-194-9354
NSN 5998-01-618-6547
NSN 6620-01-468-9288
NSN 5935-01-152-2677
NSN 6220-01-388-2269
NSN 5996-01-359-0057
NSN 4140-00-434-5001
NSN 6685-00-107-0852
NSN 5915-01-549-3131
NSN 5998-01-287-8546
NSN 6685-01-137-4726