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A New Profile for LP Records

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A new dimension has been found for the thickness of the music groove area of the long playing 12-inch stereo record. The 30-mil thickness instead of 50 mils provides turbulent mixing during the molding of the record for better groove formation and increases the flexibility of the record for its rotational engagement with the turntable. This 90-gram record development is reviewed in full.

JAES Volume 19 Issue 7 pp. 590-593; July 1971
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