LIU Dong, JIANG Yong-gua. Ultrasonic Detector for Wall Rock Crack and Its ApplicatioJ. Journal of Mine Automation, 1997, 23(1): 50-52.
Citation: LIU Dong, JIANG Yong-gua. Ultrasonic Detector for Wall Rock Crack and Its ApplicatioJ. Journal of Mine Automation, 1997, 23(1): 50-52.
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Ultrasonic Detector for Wall Rock Crack and Its Applicatio

    Abstract
  • An ultrasonic detector for wall rock crack is introduced which is able to detect coal mine underground wall rock looseness range and cracks.
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