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 5835-00-111-3419
NSN 7035-01-177-2807
NSN 5915-00-153-4865
NSN 6240-01-361-9167
NSN 6685-01-479-7349
NSN 5965-01-194-3453
NSN 5998-00-689-9749
NSN 5935-01-601-6031
NSN 5835-00-440-9066
NSN 5935-01-221-8254
NSN 6645-00-456-0080
NSN 5998-01-384-3242