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• Suspension roof support.
• Use of torque wrench to determine load in roof bolts.
• Anchorage testing of mine-roof bolts.
• Roof movement study of mechanized retreating longwall operation, Lancashire no. 15 mine, Bakerton, Cambria County, Pa.
• Use of torque wrench to determine load in roof bolts.
• Use of torque wrench to determine load in roof bolts.
• Anchorage testing of mine-roof bolts.
• Anchorage testing of mine-roof bolts.