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Dsir van Monckhoven . fr Dsir Charles Emmanuel van Monckhoven septembre Gand septembre Gand est un chimiste opticien et physicien belge google be um hl fr safe off sa biw bih tbm isch tbnid zGFLqGIAsYM refurl ua ac be htm docid YttKpsyuTWKM url ua ac be ei UeITrMamfQWbXTCQ zoom iact hc vpx vpy dur hovh hovw