What velodrome took place earlier than 1950 with a winner from France in tandem paced over a distance of 951.750 km?
CREATE TABLE "winners" (
  "year" real,
  "rider" text,
  "country" text,
  "distance" text,
  "pacing" text,
  "velodrome" text
);
SELECT "velodrome" FROM "winners" WHERE "year"<1950 AND "country"='france' AND "pacing"='tandem paced' AND "distance"='951.750 km';