- Title: Otona no Kagaku Magazine Vol. 23 - Feature: Poulsen's Telegraphone In 1898, Valdemar Poulsen of Denmark recorded his voice on piano wire, achieving the world's first magnetic recording. With the included wire recorder, you can record and play back your voice not only on the included wire, but also on everyday metals (steel) like scissors, and stainless steel that sticks to magnets. Currently discontinued and difficult to obtain, making it a rare item. Unopened and unused, it has been stored for a long time. As it is a product that you assemble yourself, there is no guarantee of operation.