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Hanging rocks: scale or fail? | Engineer Live

Scaling involves the removal of dangerous, hanging rocks before they fall due to some unplanned action. Maurice Jones reports

China coal mining equipment Manufacturer-Shandong China Coal ...

Shandong China Coal Industry & Mining Group specializing in the production of mining carts, winches, steel arch support, rock drill and other mining equipment and accessories, business honest, professional services, quality assurance, Tel: + 86-537-2350961.