Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_27 (commercial_operation VARCHAR, construction_start VARCHAR)

### Question ###
When was commercial operation where construction started June 10, 1971?

### Accurate SQL ###

SELECT commercial_operation FROM table_name_27 WHERE construction_start = "june 10, 1971"