SIGNALCORPS-AUDIO CROSS INDEX BY SIGNAL CORPS STOCK NUMBER -- SPEAKERS AND MICROPHONES. This book shows nice ink drawings of some microphones, headsets, speakers, drivers, tripods etc. Dated 1954, no cover, but it is page 3 thru the end at page 92.
The common names of 1954, WECo, Kellog, RCA, Brush, Trimm, GE, more. Some specs and various data. #SignalCorps-Audio