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 6645-00-736-0476
NSN 6320-01-185-3857
NSN 5965-01-285-7356
NSN 7035-00-782-7046
NSN 5925-01-482-3642
NSN 6105-01-427-2336
NSN 6145-00-301-9124
NSN 6110-01-496-4473
NSN 5996-00-199-9303
NSN 6150-00-994-2622
NSN 6620-01-045-4467
NSN 5920-01-603-8592