sonic signal transmitting and receiving equipment for non-destructively testing and mapping the interior of solid materials; and cross hole sonic logging instrumentation for non-destructive testing of concrete foundations for construction quality assurance

'assur':36 'concret':31 'construct':34 'cross':20 'destruct':10,28 'equip':6 'foundat':32 'hole':21 'instrument':24 'interior':15 'log':23 'map':13 'materi':18 'non':9,27 'non-destruct':8,26 'qualiti':35 'receiv':5 'signal':2 'solid':17 'sonic':1,22 'test':11,29 'transmit':3

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