Who won mixed doubles the years einar jónsson wagner walbom won mens doubles and wagner walbom won mens singles
CREATE TABLE "table1_14903999_1" (
  "year" real,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);
SELECT "mixed_doubles" FROM "table1_14903999_1" WHERE "mens_doubles"='Einar Jónsson Wagner Walbom' AND "mens_singles"='Wagner Walbom';