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(a) Elliptical stylus in a stereo groove with a sharp high-frequency modulation on one wall and a less severe waveform on the other; (b) pinch effect when hemispherical reproducing stylus travels in the varying groove formed by a plough-shaped cutting stylocked

Extract

(a) Elliptical stylus in a stereo groove with a sharp high-frequency modulation on one wall and a less severe waveform on the other; (b) pinch effect when hemispherical reproducing stylus travels in the varying groove formed by a plough-shaped cutting stylus

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