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 6320-01-659-2819
NSN 6135-00-917-1894
NSN 6110-01-166-1864
NSN 6135-00-840-6451
NSN 6130-00-116-4881
NSN 5999-01-139-3958
NSN 5985-01-429-7759
NSN 6105-00-991-1844
NSN 5998-01-254-3218
NSN 5895-00-781-0346
NSN 5915-01-525-1521
NSN 5975-00-583-8553