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 5990-01-470-2565
NSN 5998-00-387-5513
NSN 5915-01-494-8289
NSN 6220-01-658-1035
NSN 5950-01-224-7226
NSN 5935-01-617-8072
NSN 5835-00-005-7909
NSN 6135-01-512-8105
NSN 6240-01-217-0432
NSN 6135-00-725-9369
NSN 5965-01-583-5377
NSN 5996-00-182-2002