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_66983 ( "Ship" text, "Pennant number" text, "Laid down" text, "Launched" text, "Completed" text )

### Question ###
Name what was completed on 12 april 1934

### Accurate SQL ###

SELECT "Completed" FROM table_66983 WHERE "Launched" = '12 april 1934'