The Talking Machine and Radio Weekly, Jan. 1, 1930, p.14

Published at 796 × 1200 in Things I learned on Phono EQ curves, Pt. 2
The Talking Machine and Radio Weekly, Jan. 1, 1930, p.14

source <cite>EE Shumaker Sees 1930 as Profitable Notable Year in Radio<cite> <a href=httpsworldradiohistorycomArchive Talking Machine Radio WeeklyTMRW1930 01 01pdf>The Talking Machine and Radio Weekly<a> p14 January 1 1930

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