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 6610-01-586-5221
NSN 6610-01-436-2803
NSN 5999-01-649-6795
NSN 5990-01-187-8594
NSN 5905-00-621-3230
NSN 5996-01-517-2328
NSN 6150-00-824-0075
NSN 5905-00-938-7588
NSN 5935-01-207-1740
NSN 5998-00-891-3810
NSN 6105-01-014-5444
NSN 5990-01-367-9168