Variety shows were among the first programs to be featured on television during the experimental mechanical television era. Variety shows hosted by Helen Haynes and Harriet Lee are recorded in contemporary newspapers in 1931 and 1932; because of technical limits of the era, no recordings of either show have been preserved. After World War II, the genre again was an early favorite of the burgeoning electronic television industry; "Hour Glass", dating to 1946, is the earliest surviving variety show, preserved in the form of audio recordings and still photographs. The genre proliferated during the Golden Age of Television, generally considered to be roughly 1948 to 1960. Many of these Golden Age variety shows were spin-offs or adaptations of previous radio variety shows.