FTC Report of 1925
Report concerning the use of Celebrities endorsing instruments, and signed by:
C. Bruno & Sons, Buegelelsen & Jacobson, Buescher Band Instrument Co., C. G. Conn (Ltd.), E. A. Couturier Band Instrument Co., Cundy Bettoney Co., W. J. Dyer & Bro., Carl Fischer, William Frank Co., Fred Gretsch
Manufacturing Co., Frank Holton & Co., J. W. Jenkins’ Sons Music Co., Leedy Manufacturing Co., Ludwig & Ludwig,
Lyon & Healy (Inc.), Martin Band Instrument Co., Pan-American Band Instrument & Case Co., Harry Pedler Co. (Inc.), H. & A. Selmer (Inc.), The Vega Co., H. N. White Co., Rudolph Wurlitzer Co., J. W. York & Sons.
http://www.horn-u-copia.net/Docs/FTC1925.pdf