1969 Death Gladys Swarthout, U.S. mezzo-soprano/alt (La Gioconda), dies at 64 1969 Death Gladys Swarthout, opera singer and actress (Ambush), dies at 64 1969 Death Gladys Swarthout, U.S. mezzo-soprano (La Gioconda), dies at 69 1900 Birthday Gladys Swarthout, Deepwater Missouri, mezzo-soprano, La Gioconda 1869 Event Cornelius Swarthout patents waffle iron
