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

Published 2022/09/15 at 825 × 1200 in Things I learned on Phono EQ curves, Pt. 2

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

source 1598377 RECORDING SOUND Charles A Hoxie p1180 Official Gazette of the United States Patent Office Vol 349 August 1926

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