The Talking Machine World, March 15, 1922, p.8 Published 2022/09/15 at 995 × 1200 in Things I learned on Phono EQ curves, Pt. 2 ← Previous Next → source <cite>Will Radio Craze Affect Our Industry<cite> <a href=httpsworldradiohistorycomArchive Talking Machine20sTalking Machine 1922 03pdf>The Talking Machine World<a> p8 March 15 1922