What number was the pick for the position of DT in 1952, after round 1, where the overall was less than 155?
CREATE TABLE "national_football_league" (
  "year" text,
  "round" real,
  "pick" real,
  "overall" real,
  "position" text,
  "nfl_team" text
);
SELECT "pick" FROM "national_football_league" WHERE "position"='dt' AND "round">1 AND "overall"<155 AND "year"='1952';