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 6610-01-387-5630
NSN 5950-01-070-9075
NSN 5990-00-803-7475
NSN 5895-00-494-8041
NSN 6620-00-273-8735
NSN 5999-01-411-6758
NSN 6105-01-475-6944
NSN 5925-01-053-6519
NSN 6110-01-554-8653
NSN 5945-01-403-2800
NSN 6610-01-357-5957
NSN 5985-01-107-9565