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 5920-01-141-6885
NSN 5855-00-610-4052
NSN 5895-00-223-3869
NSN 5935-00-148-9378
NSN 6650-01-527-6918
NSN 5925-00-480-6710
NSN 6610-01-519-5157
NSN 6150-00-013-5613
NSN 6610-01-633-8931
NSN 5920-01-450-8382
NSN 2925-01-164-4197
NSN 5996-00-525-1777