Found on the VL Technology website. Design attributed to Zuntz. From Zimmermann, E. 1928. Psychologische und Physiologische Apparate: Liste 50. (p. 0249, fig. 3038)
Found on the VL Technology website. Design attributed to Zuntz. From Zimmermann, E. 1928. Psychologische und Physiologische Apparate: Liste 50. (p. 0249, fig. 3038)