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 5920-01-187-6100
NSN 5990-00-804-4982
NSN 6105-01-599-9665
NSN 5905-01-410-7436
NSN 5925-01-233-8598
NSN 6135-01-230-4399
NSN 6220-01-577-0328
NSN 6110-00-699-1495
NSN 5915-00-203-2859
NSN 5895-01-515-5652
NSN 5985-01-557-4308
NSN 5996-00-753-1599