The Talking Machine World, March 15, 1922, p.25

Published at 1200 × 925 in Things I learned on Phono EQ curves, Pt. 2
The Talking Machine World, March 15, 1922, p.25

source <cite>Why Music Broadcasted by Radio Should Not Hurt Sales of Talking Machine and Records<cite> <a href=httpsworldradiohistorycomArchive Talking Machine20sTalking Machine 1922 03pdf>The Talking Machine World<a> p25 March 15 1922

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