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 5975-01-406-5337
NSN 6135-01-655-1759
NSN 5895-00-656-4959
NSN 5985-00-644-9752
NSN 6650-01-147-3125
NSN 7035-01-164-6835
NSN 5965-01-010-1258
NSN 5835-00-389-2816
NSN 6650-00-078-5773
NSN 5905-01-558-3846
NSN 6620-01-363-0499
NSN 5999-01-485-0135