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 5950-01-634-0677
NSN 6650-00-144-4555
NSN 5950-01-186-0403
NSN 5985-00-141-0290
NSN 6105-01-551-1263
NSN 6240-01-189-4975
NSN 5950-01-210-8318
NSN 6130-00-925-2303
NSN 5998-01-183-1932
NSN 5985-00-944-5171
NSN 5930-00-482-3426
NSN 6220-01-634-0660