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Reel-to-reel

Technical patent drawing showing a mechanical phonograph with two reels (B and B') connected by a wax-coated ribbon (D) that passes over a guide roller (C), with a hinged cover housing an adjustable diaphragm and stylus assembly, plus detailed cross-sections of the reel and roller mechanism.

PHONOGRAPH.Eustace Oxley · September 1, 1891

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