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![Pattern of hammers and strings inside piano, close up. One hummer in action while key is pressed. Stand out from the crowd conce Stock Photo - Alamy Pattern of hammers and strings inside piano, close up. One hummer in action while key is pressed. Stand out from the crowd conce Stock Photo - Alamy](https://c8.alamy.com/comp/G6918Y/pattern-of-hammers-and-strings-inside-piano-close-up-one-hummer-in-G6918Y.jpg)
Pattern of hammers and strings inside piano, close up. One hummer in action while key is pressed. Stand out from the crowd conce Stock Photo - Alamy
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The Structure of the Piano:What is a Piano's "Action"? - Musical Instrument Guide - Yamaha Corporation
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