What country made the Flieger-Doppelpistole 1919?
CREATE TABLE "table1_29474407_11" (
  "name_designation" text,
  "year_of_intro" real,
  "country_of_origin" text,
  "primary_cartridge" text,
  "major_users" text
);
SELECT "country_of_origin" FROM "table1_29474407_11" WHERE "name_designation"='Flieger-Doppelpistole 1919';