CREATE TABLE table_19679 ("Year" FLOAT, "Mens singles" TEXT, "Womens singles" TEXT, "Mens doubles" TEXT, "Womens doubles" TEXT, "Mixed doubles" TEXT)

Who won mixed doubles the years einar j nsson wagner walbom won mens doubles and wagner walbom won mens singles
SELECT "Mixed doubles" FROM table_19679 WHERE "Mens doubles" = 'Einar Jónsson Wagner Walbom' AND "Mens singles" = 'Wagner Walbom'
SELECT "Mixed doubles" FROM "table_19679" WHERE "Mens doubles" = 'Einar Jónsson Wagner Walbom' AND "Mens singles" = 'Wagner Walbom'