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 5990-01-443-2931
NSN 6650-01-302-2647
NSN 5915-01-412-1374
NSN 6240-01-633-9357
NSN 5935-01-511-0106
NSN 6650-01-328-8363
NSN 5935-00-228-4556
NSN 5975-01-175-7409
NSN 6685-01-462-0141
NSN 6685-00-820-2104
NSN 5985-01-315-5489
NSN 6650-01-571-7122