The main correspondents during this period were Ray Wise, A. W. Lehman, Gene La Barr and his widow Flora, and Jerry Cimera. There is a letter from Louise Sparks of RCA concerning their Auxetophone, "an early electrical amplifier which was used approximately from 1910 to 1912". There is also a membership card for Mr. and Mrs. Bridges for the Musical Box Society, dated November 7, 1955 and a gold card commemorating ridges 30 years as a member of the Detroit Federation of Musicians, Local S.A.F. of M.