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_70791 ( "Model" text, "Specification" text, "Build date" text, "Total produced" real, "Wheel arrangement" text, "Prime mover" text, "Power output" text )

### Question ###
Which power output had a Build date of 1951 1956?

### Accurate SQL ###

SELECT "Power output" FROM table_70791 WHERE "Build date" = '1951–1956'