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 5960-00-740-7285
NSN 5965-00-215-5866
NSN 5999-01-498-4753
NSN 6110-00-548-3970
NSN 6650-00-170-5095
NSN 5975-01-189-6896
NSN 6320-01-177-3192
NSN 5915-01-558-7552
NSN 4140-01-071-0161
NSN 5975-01-380-0599
NSN 6620-01-534-2370
NSN 5998-01-338-2683