First introduced into portables on Sony's WM-501 Walkman (circa 1987). At that time Sony's also introduced a series of earbuds with the so-called "twin-turbo acoustic circuitry" with model numbers 414, 424, 444, 454 (which came with the WM-501) and 464 (with amorphous saphire diapharm). About a year later they introduced what I think was their best bud ever (even compared to their offerings today), the MDR-E484 with amorphous diamond diapharm.
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