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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.


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