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 5930-01-186-6793
NSN 6240-01-509-8279
NSN 5835-00-422-1441
NSN 6650-01-455-5895
NSN 5960-01-086-6735
NSN 6240-00-228-8594
NSN 6240-01-160-7934
NSN 5855-01-522-0723
NSN 5915-01-322-1364
NSN 2925-01-389-6874
NSN 5920-01-063-1874
NSN 6650-01-658-1748