Table schema:
CREATE TABLE MODEL_LIST (Maker VARCHAR, model VARCHAR); CREATE TABLE CAR_MAKERS (Maker VARCHAR, Id VARCHAR); CREATE TABLE CARS_DATA (id VARCHAR, year VARCHAR); CREATE TABLE CAR_NAMES (model VARCHAR, MakeId VARCHAR)

Question: Find the name of the makers that produced some cars in the year of 1970?
SQL: SELECT DISTINCT T1.Maker FROM CAR_MAKERS AS T1 JOIN MODEL_LIST AS T2 ON T1.Id = T2.Maker JOIN CAR_NAMES AS T3 ON T2.model = T3.model JOIN CARS_DATA AS T4 ON T3.MakeId = T4.id WHERE T4.year = '1970'