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CHEMICAL INJECTION AND WATER STOPPING CONSTRUCTION METHOD FROM INNER SURFACE OF PIPE BY THREE-DIRECTION HERMETICAL CLOSING OF T-SHAPED BRANCHED PIPE ATTACHMENT PART OF SMALL DIAMETER SEWAGE PIPE EMBEDDED IN GROUND
CHEMICAL INJECTION AND WATER STOPPING CONSTRUCTION METHOD FROM INNER SURFACE OF PIPE BY THREE-DIRECTION HERMETICAL CLOSING OF T-SHAPED BRANCHED PIPE ATTACHMENT PART OF SMALL DIAMETER SEWAGE PIPE EMBEDDED IN GROUND
