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 5835-01-291-5405
NSN 6135-00-416-2898
NSN 5920-00-473-0563
NSN 6645-01-099-2910
NSN 4140-01-121-9803
NSN 5960-01-141-6489
NSN 6130-01-371-2960
NSN 5996-01-050-2011
NSN 5950-00-269-4805
NSN 6645-00-137-5682
NSN 7035-00-104-7613
NSN 5999-01-608-6195