Engineers at AEG Develop the First Practical Tape Recorder

In 1934 engineers at AEG developed the Magnetophon K1. The K1 was the first practical reel-to-reel magnetic tape recorder, using magnetic tape invented by Fritz Pfleumer.  It was first demonstrated at the Internationale Funkausstellung Berlin (International radio exhibition Berlin, aka 'Berlin Radio Show') in 1935. The recording embedded in this entry was made on April 27, 1935.