adulthood


 * In 1667 he entered the service of the eletor of Mainz he spent the perod 1673-76 on a diplomatic mission to paris.
 * For the last 40 years of his life he did his prodigious talents under three electors.
 * His calculating machine was built to show to the royal society in 1794.
 * Most of his philosophical writing was remained unpublished until afer he died.

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