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 6105-00-141-0300
NSN 7035-00-803-3056
NSN 5910-00-355-7395
NSN 5920-01-528-8136
NSN 5905-01-634-0595
NSN 6220-00-258-2967
NSN 6150-01-469-1315
NSN 5998-00-055-3889
NSN 4140-00-282-9759
NSN 6610-01-219-8656
NSN 6105-00-031-3183
NSN 5855-01-470-4845