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 2925-00-194-7407
NSN 5999-01-322-2690
NSN 5920-01-258-2127
NSN 5985-01-360-0842
NSN 5855-01-547-2339
NSN 5905-00-246-4639
NSN 5999-00-899-6579
NSN 5950-00-338-0390
NSN 6610-01-603-7069
NSN 5945-01-214-2446
NSN 5945-00-019-7550
NSN 7035-01-469-0109