Lot Of 15 Vintage Polyphon Metal Music Disc Nice! $31.00 USD Sold on: 2013-May-12 Marketplace: eBay 1 Treasure 0 Trash 100% Detail: the music is encoded onto a metal disc with teeth around its outer edge. The discs are about the size of a CD, and the musical information is stored in them by punching and bending strips of metal so ... More Relevance Historical Items
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