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 5945-01-314-1441
NSN 6105-01-369-5457
NSN 5990-00-926-4324
NSN 5960-01-524-8642
NSN 5996-01-466-1163
NSN 5999-00-505-5586
NSN 5925-01-211-6660
NSN 5925-01-634-0664
NSN 2925-00-149-0760
NSN 5999-00-389-3117
NSN 6130-01-531-2706
NSN 6610-00-419-7844