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Stoffers, Gottfried. 1910. “Musikinstrumente”. In . Köln (Cologne): Gottfried Stoffers.
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Nicola, Vicentino. 1561. “ Catalogo Della Biblioteca Del Liceo Musicale Di Bologna”. Nicolo Bevilacqua. http://www.bibliotecamusica.it/cmbm/scripts/gaspari/scheda.asp?id=1534.
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1930. “Funk: Die Wochenschrift Des Funkwesens”. Weidmannsche Buchhandlung.
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After coming to Paris in 1851, Rudolph Koenig trained with the violin maker Vuillaume until 1858, when he launched his own instrument-making business at Place Lycée Louis-le-Grand. Koenig’s workshop participated in Paris’s flourishing activities in scientific research and instrument-making from the 1830s to the 1880s. More specifically, it contributed to the development of acoustics as an independent field of research.

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Driesen, Otto. 1913. Das Grammophon Im Dienste Des Unterrichts Und Der Wissenschaft. Band I, Teil 1: Kindergarten, Volksschule, Mittelschule, Höhere Lehranstalten. Berlin: Deutsche Grammophon-Aktiengesellschaft.
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Ellis, Alexander John. 1845. A Plea For Phonotypy And Phonography; Or, Speech-Printing And Speech-Writing.. London: S. Bagsters and Sons.
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“Index: Appunn’s “Tenor” Tonometer Recordings”. 2013.
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1926. “Funk: Die Wochenschrift Des Funkwesens”. Weidmannsche Buchhandlung.
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1926. “Funk: Die Wochenschrift Des Funkwesens”. Weidmannsche Buchhandlung.
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Buchhandlung, Weidmannsche. 1939. “Funk: Die Wochenschrift Des Funkwesens”.