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 5960-01-502-6270
NSN 5835-01-104-5707
NSN 5996-01-485-1424
NSN 5998-01-647-3624
NSN 5855-01-512-1926
NSN 5996-01-448-2754
NSN 6320-00-369-1333
NSN 5895-01-536-4648
NSN 6610-00-531-8871
NSN 6320-01-592-6248
NSN 6685-00-824-7910
NSN 5910-01-425-1185