磁带
Magnetic tape revolutionized broadcast and recording. Magnetic tape was invented for recording sound by Fritz Pfleumer in 1928 in Germany, based on the invention of magnetic wire recording by Valdemar Poulsen in 1898. Pfleumer's invention used an iron oxide (Fe2O3) powder coating on a long strip of paper. This invention was further developed by the German electronics company AEG, which manufactured the recording machines and BASF, which manufactured the tape. In 1933, working for AEG, developed the ring shaped tape head. Eduard Schüller, was a German engineer and he had a decisive role in the development of the rape recorder and the videorecorders. Previous head designs were needle shaped and tended to shred the tape.