Lou Ottens, the Dutch engineer credited with inventing the audio cassette tape, has died at the age of 94. It is estimated that 100 billion cassette tapes have been sold around the world since they were introduced in the 1960s.
Ottens also later helped develop the CD. His invention, launched in 1963, transformed the way people listened to music. Recent years have seen a resurgence of the cassette, with sales almost doubling in the UK last year.
Ottens died in his hometown of Duizel, Netherlands last Saturday, his family announced on Tuesday (March 10). He became head of Philips' product development department in 1960, where he and his team developed the cassette tape.
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