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 5935-01-050-7487
NSN 5895-01-431-0927
NSN 5910-00-505-2258
NSN 5925-00-245-3391
NSN 7035-00-163-6221
NSN 4140-00-069-5154
NSN 2925-01-633-4048
NSN 5950-01-417-0945
NSN 5930-00-865-1622
NSN 5915-01-250-8541
NSN 5950-01-437-2727
NSN 5990-01-522-6096