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M. von Helmholtz's double siren

Sirène double de M. von Helmholtz
  Source   Koenig, Rudolph. 1889. Catalogue des Appareils d'Acoustique construits par Rudolph Koenig. Paris view the source
  People   Helmholtz, Hermann Ludwig Ferdinand von (1821-1894)
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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