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 6685-01-188-1604
NSN 6645-01-424-1540
NSN 5960-01-530-0581
NSN 6130-00-196-5292
NSN 6110-00-913-2574
NSN 6220-01-547-0271
NSN 5965-01-455-7747
NSN 6645-00-222-0471
NSN 5930-01-191-7297
NSN 5855-01-391-7077
NSN 5945-01-357-4333
NSN 6130-01-418-1606