01276nam 2200361 a 450 991069727820332120230902161804.0(CKB)5470000002386137(OCoLC)645227525(EXLCZ)99547000000238613720100630d1988 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierUltrasonic method and apparatus for determining crack opening load[electronic resource] patent application[Redacted ed.][Washington, DC] :[National Aeronautics and Space Administration],[1988]1 online resource illustrationsNASA case ;LAR-13889-1Title from PDF title screen (NASA, viewed June 18, 2010).NASA case ;LAR-13889-1.Ultrasonic method and apparatus for determining crack opening load UltrasonicsUltrasonics.United States.National Aeronautics and Space Administration.GPOGPOBOOK9910697278203321Ultrasonic method and apparatus for determining crack opening load3451539UNINA