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 5999-01-512-3060
NSN 5990-00-615-5413
NSN 6320-01-629-1277
NSN 6220-00-099-9192
NSN 5998-01-093-5473
NSN 6220-01-601-1588
NSN 5925-01-513-6385
NSN 6645-00-559-3623
NSN 6240-01-469-6469
NSN 5975-01-539-7092
NSN 6105-00-019-1727
NSN 6240-01-250-3574