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 5935-01-091-8365
NSN 5835-01-223-5084
NSN 7035-00-703-3535
NSN 6650-01-552-5930
NSN 5950-01-116-2142
NSN 5998-01-380-0522
NSN 5915-00-199-9554
NSN 6320-01-390-5385
NSN 5975-01-601-6658
NSN 5915-00-078-5147
NSN 5835-01-250-2939
NSN 4140-00-277-6285