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 6220-01-660-5118
NSN 5935-01-600-5372
NSN 5930-01-089-8615
NSN 5945-01-572-5971
NSN 5895-00-932-5491
NSN 6130-00-724-2516
NSN 6145-00-847-6772
NSN 5920-01-431-3263
NSN 6645-01-066-6665
NSN 6220-01-025-6140
NSN 5915-01-057-6079
NSN 6145-00-250-4429