CREATE TABLE table_19668 ("Year" FLOAT, "Mens singles" TEXT, "Womens singles" TEXT, "Mens doubles" TEXT, "Womens doubles" TEXT, "Mixed doubles" TEXT)

WHAT ARE THE NAMES OF THE MENS DOUBLES WHEN THE WOMENS DOUBLES WAS PIRET HAMER HELEN REINO?
SELECT "Mens doubles" FROM table_19668 WHERE "Womens doubles" = 'Piret Hamer Helen Reino'
SELECT "Mens doubles" FROM "table_19668" WHERE "Womens doubles" = 'Piret Hamer Helen Reino'