26 апр 1765 г. - At Saint Petersburg, German engineer Christian Kratzenstein presents to the Russian Academy of Sciences a perfected version of the arithmetical machine originally invented by Gottfried Leibniz

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Kratzenstein claims that his machine solves the problem with the Leibniz machine has with calculations above four digits, perfecting the flaw where the machine is "prone to err whenever it is necessary to make a number of 9999 move to 10000", but the machine is not developed further.

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