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Drawing from U. S. Patent 165831, showing Hopkins’ first design improvement, an arbor for the barrel and train to turn on and the balance displaced from center.

Auteur

The Auburndale Watch Company
First American Attempt Toward the Dollar Watch
Author: Edwin A. Battison
Available from gutenberg.org

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Samedi 27 Mai 2023

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1215*452

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• Technology / Inventions

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