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 6645-00-940-0774
NSN 6240-00-292-3237
NSN 5985-01-468-5598
NSN 6645-00-300-0401
NSN 5835-00-419-0575
NSN 6320-01-216-1678
NSN 6110-01-509-0338
NSN 5915-00-188-4054
NSN 5999-00-835-9381
NSN 2925-00-243-6841
NSN 5960-01-476-5686
NSN 5905-00-191-9217