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 6320-00-823-2015
NSN 5999-00-593-8134
NSN 6650-00-695-0304
NSN 6105-01-284-6983
NSN 6220-01-391-7705
NSN 5910-00-597-5824
NSN 6130-00-289-7050
NSN 5895-01-454-2441
NSN 6150-01-576-8179
NSN 5996-01-447-1418
NSN 5835-01-208-1939
NSN 6130-01-068-4475