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 4140-01-308-1964
NSN 6130-00-598-2034
NSN 6135-01-136-8306
NSN 6220-01-156-8435
NSN 5855-00-149-0766
NSN 6650-00-342-6447
NSN 5935-01-455-9050
NSN 5950-01-323-8603
NSN 6610-01-603-0703
NSN 6145-00-570-0516
NSN 5835-01-475-5714
NSN 5895-01-589-2468