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Action (piano) - Wikipedia
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Robotran
Swenson's Piano Shop - Articles - Viennese Action
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The unique sound of Prellzungenmechanik (Viennese action) - The Coffee House - Cakewalk Discuss | The Official Cakewalk by BandLab Forum
The Evolution of the Grand Piano : r/coolguides
Swenson's Piano Shop - Articles - Viennese Action
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A History of the Piano from 1709 to 1980 by David S. Grove
