Whose address of operation was the Echirax Concession? 
CREATE TABLE table_13150274_1 (client VARCHAR, area_of_operation VARCHAR)
SELECT client FROM table_13150274_1 WHERE area_of_operation = "EchiraX Concession"
### Context: CREATE TABLE table_13150274_1 (client VARCHAR, area_of_operation VARCHAR) ### Question: Whose address of operation was the Echirax Concession?  ### Answer: SELECT client FROM table_13150274_1 WHERE area_of_operation = "EchiraX Concession"