Which is the latest year that has an engine of Offenhauser l4, a chassis of Kurtis Kraft 500c, and the entrant of Federal Engineering?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "points" real
);
SELECT MAX("year") FROM "complete_formula_one_world_championship_" WHERE "engine"='offenhauser l4' AND "chassis"='kurtis kraft 500c' AND "entrant"='federal engineering';