When was the automatic answering machine invented?

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The first commercially successful automatic answering machine was developed by Willy Müller in 1935. It used magnetic tapes to record and play back messages. Over the years, different inventors and companies continued to refine the technology.
SSPL/Getty Images
SSPL/Getty Images
When was the automatic answering machine invented?
- 1920
- 1930
- 1940
- 1950
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