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 5915-01-389-3254
NSN 6620-01-259-5944
NSN 5925-01-505-1126
NSN 6105-00-189-0515
NSN 6240-01-566-0816
NSN 5999-01-014-3470
NSN 5835-00-233-6327
NSN 6685-01-352-4564
NSN 5935-01-188-2367
NSN 6135-01-277-2562
NSN 6150-00-671-4789
NSN 5985-01-336-2406