sentences:  Despite the success of Rin Tin Tin and other projects, Warner Bros. was unable to compete with Hollywood's "Big Three" – Paramount, Universal, and First National studios.In 1925, the studio expanded its operations and acquired the Brooklyn-based theater company Vitagraph.Later that year, Sam Warner urged his brother, Harry, to sign an agreement with Western Electric to develop a series of talking "shorts" using the newly developed Vitaphone technology.