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"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_13150274_1 (client VARCHAR, area_of_operation VARCHAR) Question: Whose address of operation was the Echirax Concession?  [/INST] SELECT client FROM table_13150274_1 WHERE area_of_operation = "EchiraX Concession" </s>