“How Electrical Transcriptions are Made” (Wireless World, Nov. 24, 1938)

“How Electrical Transcriptions are Made” (Wireless World, Nov. 24, 1938)

source <cite>How Electrical Transcriptions are Made Recording in America by the Vertical Cut or Hill and Dale Method<cite> <a href=httpsworldradiohistorycomUKWireless World30sWireless World 1938 11pdf>The Wireless World Nov 24 1938<a> p458

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