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 6135-01-156-4627
NSN 4140-00-917-8734
NSN 6240-00-505-0301
NSN 5895-00-018-3858
NSN 5960-01-294-2397
NSN 5990-01-368-8208
NSN 6620-01-026-7371
NSN 5835-01-381-2683
NSN 6240-01-287-8032
NSN 6685-00-816-8838
NSN 6650-01-364-0299
NSN 5855-01-358-5253