... Copco D7 roc,Furukawa HCR 1200 and Tamrock, the products are widely used in bench and production drilling,extensional drilling , our ... Copco D7 roc,Furukawa HCR 1200 and Tamrock, the products are widely used in bench and production drilling,extensional drilling , our ... especially lend themselves to urban work such as bridge, utility line, wharfand building construction. In fact, with the development ...