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_name_18 ( owner_s_ VARCHAR, date VARCHAR, description VARCHAR )

### Question ###
Which owner has a description of Mark 1 pos and is dated 1956?

### Accurate SQL ###

SELECT owner_s_ FROM table_name_18 WHERE date = 1956 AND description = "mark 1 pos"