Forgotten audio formats: Elcaset

Ars Technica: Back before all-digital music, back before the Digital Compact Cassette, back before even the Digital Audio Tape existed, there was a strange audio device that briefly captured the imagination of Hi-Fi freaks across the world. The Elcaset, as it was called, was an enlarged cassette that started in Japan, wove its hidden, spinning spools around the world, and then finished, appropriately enough, in Finland.