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 6220-01-113-6431
NSN 5920-01-382-9379
NSN 6650-01-297-4376
NSN 6240-01-384-4868
NSN 6650-01-457-8743
NSN 5965-01-547-2587
NSN 6130-01-466-1444
NSN 2925-00-338-4667
NSN 6135-01-426-8282
NSN 5999-01-610-1503
NSN 5965-01-005-0341
NSN 5996-01-277-3912