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ES53493A1912-07-151912-07-15Un procedimiento sedimentador depurador y filtrador de aguas por medio de depósitos sistema "Conrado".
ExpiredES53493A1
(es)
Procédé de traitement des boues des eaux d'égout, dans des bassins horizontaux ou dans des fosses, séparés des dispositifs pour recueillir les boues