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 5905-01-393-0344
NSN 6610-01-633-8931
NSN 2925-00-932-6262
NSN 6610-01-389-0620
NSN 7035-01-028-4966
NSN 7035-01-505-5979
NSN 6135-00-998-5884
NSN 6135-01-512-8740
NSN 6610-01-023-1816
NSN 6145-01-629-4079
NSN 5998-01-527-1024
NSN 5945-01-582-1303