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Christoph T. M. Krause, a passionate collector of old telephones from Cologne, Germany, is captivated by the Drum Dial for its design and unique dialing method. In this second volume, he showcases the chronology of newly discovered patents developed from 1931 over two decades, highlighting this innovative and unique telephone.
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The Drum Dial - Volume 2. Back to the Future ~ A Chronology of the Patents, Christoph T. M. Krause
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- Released
- 2021
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- (Hardcover)
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