What is the fewest number of points scored by Goulds' Garage (Bristol), engines of Maserati Straight-6, in years before 1956?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT MIN("points") FROM "complete_formula_one_world_championship_" WHERE "entrant"='goulds'' garage (bristol)' AND "engine"='maserati straight-6' AND "year"<1956;