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 5950-01-291-3256
NSN 5835-01-553-6772
NSN 5915-00-251-3906
NSN 5999-00-863-3750
NSN 5985-00-167-4332
NSN 5999-01-259-2055
NSN 7035-00-922-5700
NSN 5910-00-960-7443
NSN 6130-01-649-1562
NSN 5905-01-272-2247
NSN 5920-01-049-1275
NSN 5975-00-615-2582