Bluthner
In 1873, Julius Bluthner introduced his patented “aliquot stringing system” which uses an additional un-dampened string in each note of the top three piano octaves. This fourth strings is not directly struck by the piano hammer, but rather vibrates sympathetically (much like when a conventional piano’s damper pedal is engaged).
Julius Bluthner died in 1910, and his sons Robert, Max and Bruno took control of the firm. The Bluthner family continued to operate the firm until the factory was destroyed in World War II. Although Bluthner brand pianos continued to be built throughout the 20thCentury, it was not until 1990 that the Bluthner family again gained control of operations. Bluthner pianos are still being produced today.
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