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 4140-01-290-9361
NSN 5915-01-441-2982
NSN 5999-01-433-8067
NSN 5998-00-772-6187
NSN 6320-00-977-3930
NSN 5895-00-149-1830
NSN 6145-00-403-9458
NSN 5925-00-838-4425
NSN 5945-00-597-5722
NSN 5855-01-406-2606
NSN 2925-01-132-5827
NSN 6220-00-528-7752