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 6650-01-123-7249
NSN 6620-01-018-9488
NSN 5935-01-174-7561
NSN 5915-00-546-7684
NSN 6650-01-430-9416
NSN 4140-01-380-6690
NSN 6130-00-147-6739
NSN 5935-01-254-2968
NSN 4140-00-945-4055
NSN 6620-00-018-2196
NSN 6130-00-448-2911
NSN 6240-01-568-4940