Official Gazette of the United States Patent Office, Vol. 349, p.1180 (August 1926)

Published at 825 × 1200 in Things I learned on Phono EQ curves, Pt. 2
Official Gazette of the United States Patent Office, Vol. 349, p.1180 (August 1926)

source 1598377 RECORDING SOUND Charles A Hoxie p1180 <a href=httpsbooksgooglecojpbooksid=Wx5RZFMKXcQClpg=PA1180dq=221598377222022Recording20Sound222022Hoxie22hl=japg=PA1181v=onepageq=221598377222022Recording20Sound222022Hoxie22f=false><cite>Official Gazette of the United States Patent Office Vol 349 August 1926<cite><a>

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