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1. Collection description - Frank Clyde Brown Recordings - LibGuides at Duke University

   https://guides.library.duke.edu/c.php?g=893067&p=6422051

   Brown used the Ediphone until 1939, when the Duke University Research Council granted Brown $295 to purchase a Presto Recording Machine, a (...)

2. Bibliography · Good Vibrations: The History of Electrotherapy · Duke University Library Exhibits

   https://exhibits.library.duke.edu/exhibits/show/good-vibrations/bibliography

   Davis - Patent Magneto Electric Machine for Nervous Diseases (Medical Battery).