CREATE TABLE table_62446 ("Elected" CLOB, "Assembled" CLOB, "Dissolved" CLOB, "1st member" CLOB, "2nd member" CLOB)

When was the parliament that was elected in 1509/10, and had an unknown second member, dissolved?
SELECT "Dissolved" FROM table_62446 WHERE "2nd member" = 'unknown' AND "Elected" = '1509/10'
SELECT "Dissolved" FROM "table_62446" WHERE "2nd member" = 'unknown' AND "Elected" = '1509/10'