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E21C45/00—Methods of hydraulic mining; Hydraulic monitors
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FR635875D1927-06-111927-06-11Perfectionnements apportés aux procédés pour l'exploitation de l'or, et autres métaux, des alluvions
ExpiredFR635875A
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Perfectionnements à la réduction du carbonate de calcium et à la fabrication de carbures, ainsi qu'à la réduction des minerais ou la fabrication de métaux ou alliag