Apparently, Freud can show up in some random-ass places:
Magnetic and optical carriers are used for analogue and digital signals while in practice mechanical carriers, in the form of cylinders or discs, have only been used for analogue signals and MO-disks solely for digital recordings. Metal matrices - negatives (fathers), positives (mothers), and stampers (sons), are used for the production of mechanical carriers as well as for CDs and DVDs.
The Safeguarding of the Audio Heritage: Ethics, Principles and Preservation Strategy
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