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The new air compressors which furnish power to drive the drills, about 500 feet below the surface of the earth.

The new air compressors which furnish power to drive the drills, about 500 feet below the surface of the earth.

The new air compressors which furnish power to drive the drills, about 500 feet below the surface of the earth.

The new air compressors which furnish power to drive the drills, about 500 feet below the surface of the earth.