domenica 24 luglio 2016
domenica 5 giugno 2016
Henri Pape's patent felt and it's application on Pleyel pianos during Chopin's lifetime
http://www.pdf-archive.com/2016/06/05/pape-pleyel-hammers-in-the-time-of-chopin/preview/page/1/
This PDF is downloadable at the linked page
This PDF is downloadable at the linked page
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