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Tilting bar

Patent drawing showing an Edison phonograph mechanism with a cloth-wrapped speaking horn, a coiled wire leading to a circuit controller plug, a cylindrical mandrel labeled 1, a rocking holding arm numbered 2, an electro-magnet and tilting bar assembly with armature 17, and a separate diagram of the recorder/reproducer plate with cam and pivot mechanisms labeled 20 through 30.

PHONOGRAPHThomas A. Edison · April 25, 1893

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