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Use of sonic techniques in exploring coal-mine roof strata :a progress report

Development of a hydraulic device for measuring relative pressure changes in coal during mining :a progress report

Published Year

• 1960-1969 (2)

Subject

• Coal mines and mining (2) *
• Mine roof control (1)
• Pressure gages (1)
• Sonar (1)

Author

• Miller, Thomas C. (2) *
• Mongan, Charles E., (1)
• Sporcic, Rudolph. (1)

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