Beatrice Benaderet (/ˌbɛnəˈdɛrət/ BEN-ə-DERR-ət; April 4, 1906 – October 13, 1968) was an American actress and comedienne. Born in New York City and raised in San Francisco, she began performing in Bay Area theatre and radio before embarking on a Hollywood career that spanned over three decades. Benaderet first specialized in voice-over work in the golden age of radio, appearing on numerous programs while working with comedians of the era such as Jack Benny, Burns and Allen, and Lucille Ball. Her expertise in dialect and characterization led to her becoming Warner Bros.' leading voice of female characters in their animated cartoons of the early 1940s through the mid-1950s. Benaderet relocated to Hollywood in 1936 and joined radio station KHJ, making her network radio debut with Orson Welles for his Mercury Theatre repertory company heard on The Campbell Playhouse. The following year she received her first big break in the industry on The Jack Benny Program, where she played Gertrude Gearshift, a wisecracking telephone operator who gossiped about Jack Benny with her cohort Mabel Flapsaddle (Sara Berner).Intended as a one-time appearance, the pair became a recurring role starting in the 1945–46 season, and in early 1947, Benaderet and Berner momentarily took over the NBC switchboards in Hollywood for publicity photos. She performed in as many as five shows daily, causing her rehearsal dates to conflict with those of The Jack Benny Program and resulting in her reading live as Gertrude from a marked script she was handed upon entering the studio.

Wikipedia