Table schema:
CREATE TABLE table_name_6 (velodrome VARCHAR, distance VARCHAR, pacing VARCHAR, year VARCHAR, country VARCHAR)

Question: What velodrome took place earlier than 1950 with a winner from France in tandem paced over a distance of 951.750 km?
SQL: SELECT velodrome FROM table_name_6 WHERE year < 1950 AND country = "france" AND pacing = "tandem paced" AND distance = "951.750 km"