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 5925-01-634-0664
NSN 5998-01-310-8725
NSN 5965-00-892-3665
NSN 6610-00-007-6832
NSN 6610-00-269-4506
NSN 6150-01-231-6142
NSN 5999-00-202-0788
NSN 5950-01-644-2683
NSN 5965-01-247-5696
NSN 5855-01-398-9548
NSN 6320-01-335-8336
NSN 6610-01-474-5206