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I wonder from what source the date of 1890 was obtained? (I think this roughly correct, but would like to know any sources available).

There is some additional information and photos about the Charpentier Calculimètre at http: retrocalculators.com Charpentier.aspx

Richard in San Francisco
7/20/2007 5:59:42 PM - US  | commentreply

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