Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_39 (nat VARCHAR, ship_type VARCHAR, estimate VARCHAR)
### Question:
Which nation had a battlecruiser with an estimate of 513?
### Answer:
SELECT nat FROM table_name_39 WHERE ship_type = "battlecruiser" AND estimate = "513"