First audio cassette of any kind. Invented by Willy Hornauer in 1925. Semi J. Begun of Ferdinand Schuchardt AG used Hornauer's cassette in the Dailygraph. The technology eventually came under the Lorenz company, where it was further developed by Semi Begun and marketed as the Textophon, which was specifically designed for dictation, with foot pedals and recording time indicators. Textophons were sometimes set up in a remote location connected to offices by a local telephone network.

The earlier cassette for the Dailygraph was fully enclosed. This version, with the wire partially exposed, was introduced by Lorenz in 1936.