![](http://www.alamy.com/thumbs/6/62775133-E031-4C1E-9DCE-CAF8FBFB5AB1/2WP5N6T.jpg)
Italian theory from the 18th century - general view, according to: Paul de Wit, Perlen aus der instrumenten -sammlung von Paul de Wit, Leipzig 1892; before (1900-00-00-1916-00-00);
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Photo credit: © piemags/POL24 / Alamy / Afripics
License: Licensed
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