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 5945-01-029-2465
NSN 5910-00-098-8735
NSN 6110-00-482-1982
NSN 5950-01-559-4494
NSN 5945-00-478-7385
NSN 5835-01-422-2399
NSN 6240-01-414-6074
NSN 6145-00-617-4032
NSN 5999-00-511-9808
NSN 5998-00-842-9013
NSN 7035-01-461-7742
NSN 5925-00-302-4637