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Microphone with vertical coals

Microphone à charbons verticaux
  Source   Verdin, Charles. 1882. Catalogue des instruments de précision servant en physiologie et en médecine construits par Charles Verdin. Chateauroux (Collection Rand B. Evans) view the source
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ISSN 1866-4784: reference - xlink
 
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Max Planck Institute for the History of Science, Berlin
Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg
Fakultät Medien, Bauhaus-Universität Weimar