CREATE TABLE table_name_75 (competition VARCHAR2, venue VARCHAR2, notes VARCHAR2, year VARCHAR2)

Prior to 2004, what was the name of the competition that took place in Johannesburg, South Africa and had the 400 m hurdles event?
SELECT competition FROM table_name_75 WHERE notes = "400 m hurdles" AND year < 2004 AND venue = "johannesburg, south africa"
SELECT "competition" FROM "table_name_75" WHERE "400 m hurdles" = "notes" AND "johannesburg, south africa" = "venue" AND "year" < 2004