Who was the winning team before 1956 on October 21?
CREATE TABLE "1950s_giants_13_7" (
  "year" real,
  "date" text,
  "winner" text,
  "result" text,
  "loser" text,
  "location" text
);
SELECT "winner" FROM "1950s_giants_13_7" WHERE "year"<1956 AND "date"='october 21';