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Feed screw drive

Patent drawing showing a phonograph mechanism with a screw-driven shaft, pinion, and toothed rack that rotates and bodily moves a turntable holding a spiral-grooved record disk beneath a fixed reproducer arm and stylus, illustrated across five figures including plan views, side cross-sections, and a top-down view of the record and tone arm assembly.

SOUND-REPRODUCING APPARATUSSamuel D. Mott · November 27, 1917

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