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 5965-01-322-8136
NSN 6650-01-122-6734
NSN 5945-01-431-0784
NSN 5985-01-141-7059
NSN 5945-01-634-0588
NSN 6645-01-614-4838
NSN 5925-00-165-8694
NSN 5855-00-879-5849
NSN 5960-01-518-4440
NSN 5935-01-363-9628
NSN 5985-01-609-7964
NSN 5965-00-328-6884