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An Early (1844) Key-Driven Adding Machine
Figure 8.
The inside of Schwilgué 's adding machine in Zurich (1851). (Photograph by the author, courtesy of the Swiss Federal Institute of Technology, Zurich.)
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The inside of Schwilgué 's adding machine in Zurich (1851). (Photograph by the author, courtesy of the Swiss Federal Institute of Technology, Zurich.)
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