Portrait photograph of the inventor Valdemar Poulsen in his wireless telegraphy station

In 1893, Valdemar Poulsen was employed—without a university degree—as a test engineer at the Copenhagen-based Telefon-Gesellschaft and dealt with voice transmission. In 1898 he designed the first device for the electromagnetic recording of sound—the "Telegraphone." His second significant invention was the arc converter in 1903 which was used in the first wireless transmission of voice—a pioneering achievement in the development of wireless communication and radio.