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_19668 ( "Year" real, "Mens singles" text, "Womens singles" text, "Mens doubles" text, "Womens doubles" text, "Mixed doubles" text )

### Question ###
WHAT ARE THE NAMES OF THE MENS DOUBLES WHEN THE WOMENS DOUBLES WAS PIRET HAMER HELEN REINO?

### Accurate SQL ###

SELECT "Mens doubles" FROM table_19668 WHERE "Womens doubles" = 'Piret Hamer Helen Reino'