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Stern's tone variators, Max Kohl, Chemnitz, Germany, c. 1900 - Putnam Gallery - Harvard University - DSC08076
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Creazilla
Author:
Daderot
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commons.wikimedia.org
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gold
self-published work
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author died more than 100 years ago public domain images
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max kohl ag, chemnitz
scientific instruments in the harvard university science center
tone variators
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