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Ultrasonic convergence measurements

Detection of roof instability by monitoring the rate of movement

Published Year

• 1980-1989 (2)

Subject

• Mine roof control (2) *
• Coal mines and mining--Equipment and supplies--Safety measures (1)
• Ultrasonic testing (1)

Author

• McVey, James R. (2) *
• Maleki, Hamid N. (1)

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