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 6220-01-260-7994
NSN 5999-01-215-3956
NSN 5999-01-012-1421
NSN 5985-01-546-2377
NSN 6130-00-410-9348
NSN 6240-01-327-1839
NSN 5835-00-943-2763
NSN 6110-01-370-8642
NSN 5990-01-017-8280
NSN 6220-00-227-0528
NSN 5920-01-183-9853
NSN 6685-01-647-8570