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APPARATUS TO FIND OUT THE LEAKAGE POINT OF CONCRETE TUNNEL LINING BY PREPARING THE PRECISE LEAKAGE TEST AND GROUND WATER PRESSURE CONTROL ARRANGEMENT FOR THE PRESSURE WATER TUNNEL WITH CONCRETE LINING
APPARATUS TO FIND OUT THE LEAKAGE POINT OF CONCRETE TUNNEL LINING BY PREPARING THE PRECISE LEAKAGE TEST AND GROUND WATER PRESSURE CONTROL ARRANGEMENT FOR THE PRESSURE WATER TUNNEL WITH CONCRETE LINING