Budlong, Robert D., Zenith Radio Corp., 5 G 003 ZZ Holiday
Bauer, Ben, Shure Brothers Company, Shure Mikrophone 556 B Unidyne
Glover, Frank, Bendix Radio, 115
Stromberg-Carlson Co., 1400
Sparks-Withington Company, Sparton 132 Football
Zenith Radio Corp., T 402-F
Zenith Radio Corp., T 402-V
Bauer, Ben, Shure Brothers Company, Shure Microphone PE 55 Unidyne II
Bauer, Ben, Shure Brothers Company, Shure Microphone 55 S Unidyne, "Baby Unidyne"
N. V. Philips' Gloeilampenfabrieken, 21 RD 253 A Automatic, Leonardo Spezial Kombinationstruhe
Zenith Radio Corp., M 510 Y
Gugelot, Hans, Max Braun oHG, PKG "Langer Heinrich"