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 5915-01-142-2000
NSN 5835-00-447-1924
NSN 5920-01-046-4248
NSN 5925-00-770-4068
NSN 5965-00-513-1352
NSN 5930-00-453-2003
NSN 5855-00-797-8217
NSN 6620-01-359-9363
NSN 5935-00-480-0475
NSN 5915-01-226-4300
NSN 6105-01-447-2984
NSN 5855-01-476-4219