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: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6145-00-521-0001
NSN 7035-01-243-8523
NSN 5925-00-952-0618
NSN 5999-01-654-8891
NSN 5930-00-290-5894
NSN 5925-01-501-0727
NSN 5998-00-288-1902
NSN 5920-01-228-4384
NSN 6110-00-109-5758
NSN 5975-01-603-2145
NSN 2925-01-532-2477
NSN 5935-00-842-1714