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 6240-01-621-7646
NSN 5855-01-255-1688
NSN 7035-01-502-9967
NSN 6130-01-089-8154
NSN 6650-01-588-8486
NSN 5855-00-466-2309
NSN 6240-00-340-6977
NSN 5930-00-617-7312
NSN 6610-01-272-8625
NSN 6620-01-396-0929
NSN 5999-01-245-0419
NSN 6105-01-416-6311