Hackaday: Tefifon: Germany’s Tape-Shaped Record Format. “Recently the [Our Own Devices] YouTube channel took a gander at the Tefifon audio format. This was an audio format that competed with shellac and vinyl records from the 1930s to the 1960s, when the company behind it went under.”
https://rbfirehose.com/2025/08/31/tefifon-germanys-tape-shaped-record-format-hackaday/









