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 5950-01-407-1594
NSN 5950-00-293-8260
NSN 5925-01-544-3613
NSN 5910-00-882-1288
NSN 5895-00-611-0418
NSN 5910-00-557-0923
NSN 5930-01-039-8398
NSN 5999-00-298-8310
NSN 6135-01-328-0639
NSN 5950-01-124-8843
NSN 2925-01-032-3814
NSN 5905-01-230-2593