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D'olier patent

Patent drawing of a disc phonograph top plan view showing the tone arm, horn, sound box with stylus riding on a spiral-grooved record, and an automatic stop mechanism with a pivoted arm, rod, and brake linkage mounted near the platen edge, with additional detail views of the brake components below.

AUTOMATIC STOP FOR PHONOGRAPHS.Francis W. D'Olier · April 13, 1915

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