Apparatus for picking up and analyzing emitted accoustic and ultrasonic signals by means of a piezoelectric pick up element connected to an amplifier with {TAIL ~ high input resistance}, the output of the amplifier being connected for further evaluation to selective circuits and to {HEAD ~ an evaluation device} 
Apparatus for picking up and analyzing emitted accoustic and ultrasonic signals by means of a piezoelectric pick up element connected to an amplifier with { TAIL ~ high input resistance } , the output of the amplifier being connected for further evaluation to selective circuits and to { HEAD ~ an evaluation device }
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