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Heat-plastic medium

Patent drawing showing a boxed phonograph apparatus with a diaphragm and needle above a central roller, flanked by heating and cooling chambers labeled E and F containing a recording strip guided by pulleys and rollers, with gears and a motor below, plus a separate figure of a cylindrical phonograph with a lamp for heating the recording sheet.

PHONOGRAPH.George H. Herrington · December 1, 1891

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