DescriptionTelegrafon8154.jpg Magyar: Valdemar Poulsen mágneses hangrögzítő készüléke 1898-ból. A Brede Værk ipari múzeumban látható a dániai Lingbyben
choice. This image is a derivative work of the following images: File:Telegrafon_8154.jpg licensed with Cc-by-sa-2.5, GFDL 2009-10-25T10:09:39Z Nico-dk 1600x1200
choice. This image is a derivative work of the following images: File:Telegrafon_8154.jpg licensed with Cc-by-sa-2.5, GFDL 2009-10-25T10:09:39Z Nico-dk 1600x1200