The Billboard, p.4, January 2, 1932 Published 2022/09/22 at 600 × 505 in Things I learned on Phono EQ curves, Pt. 2 ← Previous Next → source <cite>Grigsby Grunow Buys CPC Control<cite> <a href=httpsworldradiohistorycomhd2IDX BusinessMusicBillboard IndexIDX1932BB 1932 01 02 IDX 4pdf> The Billboard p4 January 2 1932<a>