What is the Model of the Engine with 29 Seats Built in 1941–1942?
CREATE TABLE "p_series_1939_1944" (
  "model" text,
  "built" text,
  "quantity" real,
  "seats" real,
  "length" text,
  "engine" text
);
SELECT "model" FROM "p_series_1939_1944" WHERE "seats"=29 AND "built"='1941–1942';