E21D2009/0642 - CPC Classification

• E21D2009/065 » {with devices for provisionally supporting the front face} 0
• E21D2009/0657 » {structurally associated with rock crushers} 0
• E21D2009/0664 » {with means for applying a coating layer to the front face, e.g. by spraying} 0
• E21D2009/0671 » {with means for consolidating the rock in front of the shield by injection of consolidating substances through boreholes} 0
• E21D2009/0678 » {Adding additives, e.g. chemical compositions, to the slurry or the cuttings (bentonite shall not be coded)} 0