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DEVICE FOR AUTOMATIC CONTROLLING LIQUID PUMP, MAINLY ONE OR MORE DOWNSTREAM PUMPS INSTALLED IN UNCOVERED TRENCH, CHANNEL OR SIMILAR OF THE WORK SITES OF PREPARATORY CHARCTER
DEVICE FOR AUTOMATIC CONTROLLING LIQUID PUMP, MAINLY ONE OR MORE DOWNSTREAM PUMPS INSTALLED IN UNCOVERED TRENCH, CHANNEL OR SIMILAR OF THE WORK SITES OF PREPARATORY CHARCTER