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[Contact Clocks]

Bowditch-Baltzar´s metronome-contact clock

Metronom-Kontaktuhr n. Bowditch.-Baltzar

  Source   Zimmermann, E. 1928, ca. Apparate für Psychologie, Pädagogik, Physiologie, Psychotechnik, Mikrotome. Leipzig: Hermann Heine & Co. (Collection Rand B. Evans) view the source
  People   Bowditch, Henry Pickering (1840-1911)
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ISSN 1866-4784: reference - xlink