A Wiesenthal & Cie Herrmann's Rechenknecht circular slide rule,the printed dial, in brass casing on cast iron tripod stand with operating control below, 6in (15cm) diameter
A Wiesenthal & Cie Herrmann's Rechenknecht circular slide rule,the printed dial, in brass casing on cast iron tripod stand with operating control below, 6in (15cm) diameter
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
