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 5835-01-062-4213
NSN 6105-00-356-7806
NSN 6620-01-494-9858
NSN 5985-00-541-7714
NSN 6240-00-505-6099
NSN 5996-01-010-4333
NSN 7035-00-179-3924
NSN 5960-01-087-8687
NSN 7035-01-452-0396
NSN 6685-00-356-2540
NSN 5835-01-501-0526
NSN 5998-00-156-7249