CREATE TABLE table_66983 ("Ship" CLOB, "Pennant number" CLOB, "Laid down" CLOB, "Launched" CLOB, "Completed" CLOB)

Name what was completed on 12 april 1934
SELECT "Completed" FROM table_66983 WHERE "Launched" = '12 april 1934'
SELECT "Completed" FROM "table_66983" WHERE "Launched" = '12 april 1934'