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 5920-01-512-8586
NSN 5960-01-407-1350
NSN 5920-01-206-3977
NSN 2925-01-199-7394
NSN 5990-01-054-4255
NSN 5960-00-186-6344
NSN 5998-01-494-9215
NSN 2925-00-605-8520
NSN 5960-01-495-0859
NSN 6645-00-602-5968
NSN 7035-00-320-5644
NSN 2925-01-424-0235