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![Infrequent Sound [sex.tex] technology: Toshiba HR40X - 4 Channel Quadrophonic Headphones, 1973, made in Japan](https://2.bp.blogspot.com/-JoSy-uBOjMI/VoD4HW7lz6I/AAAAAAAAgRM/VnzXt52_Meg/s1600/IMG_6709.JPG "Infrequent Sound [sex.tex] technology: Toshiba HR40X - 4 Channel Quadrophonic Headphones, 1973, made in Japan")
Infrequent Sound [sex.tex] technology: Toshiba HR40X - 4 Channel Quadrophonic Headphones, 1973, made in Japan
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