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IMPERMEABLE ACID-PROOF AND AKALI-PROOF TUBE JOINT FOR INTERCONNECTING PIPES OF CONCRETE OR REINFORCED CONCRETE ENGINEERING STRUCTURES AND METHOD FOR FORMING THE TUBE JOINT
IMPERMEABLE ACID-PROOF AND AKALI-PROOF TUBE JOINT FOR INTERCONNECTING PIPES OF CONCRETE OR REINFORCED CONCRETE ENGINEERING STRUCTURES AND METHOD FOR FORMING THE TUBE JOINT