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High-Density Disc Recording Systems

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Continuing investigation in the field of high-density disc recording has resulted in a 4 1/6 rpm record with a playing time of 20 hours. Some of the history and reasoning underlying this development is presented, description of the processes and elements of the system is given, and the potential of the system is assessed.

JAES Volume 17 Issue 3 pp. 309-311; June 1969
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